JP6895151B1 - Standing sign system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a worker to safely and securely perform work on a work object by using a ladder even in a site where it is difficult to properly install a ladder as a scaffold. SOLUTION: A standing signboard system 10 has a standing signboard 20 as a work object and a ladder 40. The standing signboard 20 has a support column 22 and a display board 30. The display plate 30 is connected to the support column 22 so as to be tiltable about the horizontal axis with respect to the vertical reference plane. The display plate 30 is fixed to the support column 22 in a posture in which the display plate 30 is tilted at a target angle with respect to the vertical reference plane. The ladder 40 is fixed to the standing signboard 20 in a posture in which the display board 30 is tilted in generally the same direction as the tilting direction. As a result, even in an area where it is difficult to properly install the ladder 40, an operator climbs the ladder 40 between the tilting display board 30 and the ladder 40 to the display board 30. The space required to perform the work is secured. [Selection diagram] Fig. 3

Description

The present invention relates to a technique that enables an operator to safely and securely perform work on a work object even in a field where it is difficult to properly install a ladder as a scaffold.

In order for an operator to work on a work object, it may be necessary to position a ladder relative to the work object and work while climbing the ladder.

As such a work object, there is a signboard. Signs are used to present visual information virtually indiscriminately to people or potential users or customers around or far away.

This sign is classified into multiple types from various aspects.

Specifically, for example, the signboard is of a type installed indoors from the aspect of its installation space, for example, built into a wall surface, suspended from the ceiling (for example, Patent Document 5, wall signboard, hanging signboard, etc.) and outdoors. It is classified into types installed in (for example, Patent Documents 1 and 2, outdoor signboards, etc.), types installed on the roof (rooftop signboards, etc.), and types installed in vehicles (hanging signboards, etc.). ..

Further, the signboard is installed on a self-supporting type, for example, a standing signboard (for example, Patent Documents 1 and 3) and an ancillary type, for example, a side wall or ceiling of a building, a ceiling of a vehicle, etc. from the aspect of its installation method. It is classified into types (for example, Patent Document 2 as an exterior signboard, wall signboard, protruding signboard, hanging signboard, etc.).

Further, the signboard is classified into a type installed in the center of the area and a type installed near the inside of the boundary line of the area from the aspect of the place where the signboard is installed. Here, the term "area" includes, for example, a site (such as separated land), and further includes a rooftop surface of a building that is divided.

Further, the signboard is of a type installed in a low place (for example, above the ground, in the air where the height is less than about 1.5 or 2 m from the ground, etc.) from the aspect of its height direction position (for example, Patent Document 3). ) And a type (for example, Patent Documents 1 and 5) installed at a high place (for example, in the air having a height of about 1.5 or 2 m or more from the ground).

Further, the signboard is small (for example, one having a height of less than about 2 m) (for example, Patent Document 3) and large (for example, having a height of about 2 m or more) from the aspect of its height direction size. (For example, Patent Documents 1 and 5).

Further, the signboard is classified into a single-sided display type (for example, Patent Document 1-3) and a double-sided display type (for example, Patent Document 4) from the aspect of the information display method thereof.

Further, the signboard is classified into a portable type, for example, a slide type (for example, Patent Document 3) and a fixed installation type (for example, Patent Documents 1 and 2) from the aspect of its portability.

Furthermore, from the viewpoint of the type of work for changing the characters on the signboard (hereinafter, also simply referred to as "change work"), the signboard is a type in which the worker manually performs the change work and an automatic change work. It is classified into the type performed in.

As a type in which the operator manually performs the change work, there is a type in which the entire operator is raised from the support surface so that the operator's hand or the extension member operated by the operator can reach a high place. Examples include a type in which an operator uses a ladder (for example, Patent Documents 5 and 6), a type in which a stepladder is used (for example, Patent Document 5), and a type in which an elevator is used.

As a type in which the worker manually performs the change work, there is a type in which the worker is assisted in performing the change work without rising from the support surface. Specifically, for example, the worker manually performs the change work. There is a type (for example, Patent Documents 1 and 2) in which a rod-shaped member (extension member) is manipulated to access a high place by the rod-shaped member.

Further, from the aspect of its use, the signboard has a type that advertises / advertises (for example, Patent Documents 1 and 3) and a type that provides guidance, for example, route guidance and price guidance (for example, Patent Document 1). It is classified into a type that provides some information, a type that gives a warning, and another type.

Japanese Patent No. 3495949 Japanese Unexamined Patent Publication No. 10-228910 JP-A-2010-224211 Japanese Unexamined Patent Publication No. 2008-139511 Japanese Patent No. 5547308 Japanese Unexamined Patent Publication No. 2015-124588

It is not always possible for workers to change the information displayed on the signboard safely and securely.

For example, if the signboard is a fixed installation type and it is large, the worker is required to change the signboard at a high place.

In this case, in the case of the conventional standing signboard, as illustrated in the side view in FIG. 2A, if the standing signboard is installed near the boundary line in the area, the worker can use the ladder as a scaffolding. Could not be installed at an appropriate position in the same area, and therefore it was difficult to change the display surface (back side display surface or rear side display surface) facing the outside of the area.

Further, in the case of a conventional standing signboard, as illustrated in the side view in FIG. 3B, if the standing signboard is installed near the fence installed near the boundary line in the area, the work The person could not install the ladder in a posture of tilting it at a sufficiently large angle as the scaffolding, and therefore, it was difficult to change the display surface (back side display surface or rear side display surface). ..

As described above, in the case of the conventional standing signboard, in the case of the single-sided display type, it is the only display surface facing the outside of the area, and in the case of the double-sided display type, the display surfaces on both sides. There was a working environment in which the change work for those facing the outside of the area was more difficult than the change work for the display surface (front side display surface or front side display surface) facing the inside of the area.

Here, the outside of the area is an adjacent land, and the adjacent land does not always have the same terrain as the area (for example, flat land), for example, a waterway, a cliff, a lowland leveled with concrete, a railroad track, etc. , The terrain may be physically dangerous if a worker falls there. In this case, the worker may foresee the possibility that personal safety may not be guaranteed at the stage of installing the ladder or at the stage of climbing the ladder and performing the change work.

In particular, when the adjacent land is a railroad track, the worker must endure the wind pressure generated by the passage of the train each time the train passes and maintain his / her own posture, which causes anxiety and danger. Along with this, change work will be carried out. In addition, workers could fall off the ladder and be injured or even killed in the unlikely event.

Against this background, the present invention enables an operator to safely and securely work on a work object even in a field where it is difficult to properly install a ladder as a scaffold. It was made with the task of providing the technology to make it.

Further, the present invention provides structures (eg, stationary objects, signboards, buildings, structures, moving objects, moving objects) even in sites where it is difficult for workers to properly install ladders as scaffolding. Of the bodies, vehicles, ships, airplanes, man-made objects, natural objects, etc.), for example, work on vertical surfaces (for example, wall surfaces, glass surfaces, pillar surfaces, signboard display surfaces, etc.) (eg, repair, painting, etc. The task was to provide technology that enables safe and secure cleaning, signboard installation, signboard removal, signboard content change, etc.).

Further, the present invention has been made as an object to provide a novel technique for a worker to position a ladder relative to a work object such as a structure.

According to the present invention, the following aspects can be obtained. Each aspect shall be divided into sections, each section shall be numbered, and the numbers of other sections shall be cited as necessary. This is to facilitate understanding of some of the technical features that can be adopted by the present invention and combinations thereof, and the technical features that can be adopted by the present invention and combinations thereof are limited to the following aspects. Should not be interpreted as. That is, it should be interpreted that it is not hindered from appropriately extracting and adopting the technical features described in the present specification as the technical features of the present invention, which are not described in the following aspects.

Furthermore, describing each term in the form of quoting the numbers of the other sections does not necessarily prevent the technical features described in each section from being separated and independent from the technical features described in the other sections. It does not mean, and it should be interpreted that the technical features described in each section can be made independent as appropriate according to their properties.

(1) It is a signboard system
A signboard having a display board capable of displaying information on an information display surface which is at least one of the front surface and the back surface, and
Including a ladder used as a scaffolding for the worker to perform work on the information display surface.
The signboard is further
With at least one strut extending upward from the support surface,
A display board connector for connecting the display board to the at least one support column so as to be tiltable about the horizontal axis with respect to the vertical reference plane.
A display plate fixture for fixing the display plate to at least one support column in a posture in which the display plate is tilted at a target angle with respect to the vertical reference plane.
The information of the display board in a tilted posture as the ladder moves from the lower side to the upper side of the display board in a direction generally the same as the direction in which the display board tilts with respect to the signboard. A vertical sign system that includes a ladder support unit that supports in a tilted position (so that it extends generally parallel to the display surface).

(2) In a plan view, the signboard is fixedly installed near the inside of the boundary line of the area and generally parallel to the boundary line.
The vertical signboard system according to item (1), wherein the display board has a surface facing the outside of the area as the information display surface.

(3) In a plan view, the signboard is fixedly installed near the inside of the boundary line of the area and generally parallel to the boundary line.
The display board has a front side display surface facing the center of the area and a back side display surface facing the outside of the area.
In order for the operator to perform the change work on the back side display surface, the display plate has the display plate fixture, the display plate is the vertical reference surface, and the lower end portion of the display plate is the upper end portion. Fixed in a tilted position closer to the center of the area
In order for the operator to perform the change work on the back side display surface, the ladder is tilted as the ladder moves from the lower side to the upper side of the display plate by the ladder support unit. The vertical signboard system according to item (1), which is fixed in a posture extending in a direction generally parallel to the back display surface.

(4) The display board has an upper end portion and a lower end portion, and has an upper end portion and a lower end portion.
The vertical signboard according to any one of (1) to (3), wherein the display board is supported by at least one support column so as to be tiltable around a horizontal axis extending along the upper end portion. system.

(5) The at least one support column includes a pair of columns extending in parallel with each other with a gap in the horizontal direction.
The lower end of the ladder is supported by the support surface, and the ladder can be tilted with the lower end as a fulcrum.
The ladder support unit is
At least one flexible first rope that is open or closed, passing laterally behind the ladder to reach the pair of stanchions or via those struts. As such, supported by the pair of struts, each first rope has a length, which length is the vertical reference plane as the ladder approaches from the lower end to the upper end of the ladder in side view. It is possible to hold the rope in an inclined posture with respect to the vertical reference plane in a direction in which the horizontal distance from the rope becomes longer.
Supports for supporting each first rope in the pair of struts so that the vertical position of each first rope is defined (eg, first connector, second connector, longitudinal direction described below). Rope etc.) and
At least one second rope extending horizontally between the pair of struts in the vicinity of the support surface, the lower part of the ladder by constant or temporary contact with the lower part of the ladder. The standing sign system according to any one of (1) to (4), including the one that restricts the unscheduled horizontal movement of the above.

(6) The at least one first rope includes a plurality of first ropes so as to be different from each other with respect to the vertical position, and the first ropes have different lengths from each other (1) to. The standing sign system according to any one of (5).

(7) The at least one first rope is coated with a synthetic resin, and the synthetic resin is used between the at least one first rope and the ladder and each of the pair of columns. The vertical sign system according to any one of (1) to (6), which increases the frictional force.

(8) The ladder support unit is
During work, the upper part of the ladder is supported generally horizontally forward from behind it, thereby mechanically limiting the unplanned backward tilt of the upper part of the ladder from the target leaning position. A ladder upper stabilizer that dynamically stabilizes the upper part of the ladder,
Includes a ladder lower stabilizer that mechanically stabilizes the lower part of the ladder by mechanically limiting unplanned deviations in which the lower part of the ladder deviates horizontally from a predetermined area during work.
The at least one strut comprises a pair of strut extending horizontally with a gap in parallel with each other.
The ladder top stabilizer comprises at least one rope that extends generally horizontally while being supported by the pair of stanchions, the rope that extends the top of the ladder horizontally forward from behind it. , When the frictional force generated with the ladder is large, the relative slip to the ladder is prevented, while when the frictional force is small, the selective slip prevention state which allows the relative slip to the ladder is allowed. The standing sign system according to any one of (1) to (7), wherein the unplanned backward tilt is prevented by supporting the system.

(9) The at least one support column includes a pair of columns extending in parallel with each other with a gap in the horizontal direction.
Two shafts project from these columns in the directions facing each other in the horizontal direction, respectively.
The vertical signboard system according to any one of (1) to (8), wherein each of the shafts swingably supports the display board on both sides of the display board separated in the horizontal direction.

(10) Any of the items (1) to (9), the worker climbs and descends the inner side surface of the ladder with his / her back facing the inner side surface facing the signboard. Standing signboard system described in Crab.

(11) A ladder support unit that supports the ladder so that when the worker uses the ladder as a scaffold to work on the work object, the ladder is tilted in a direction away from the work object. There,
A pair of columns belonging to the work object or independent of the work object are arranged so as to be horizontally separated from each other along the work object in the vicinity of the work object in a plan view. Together, they extend generally vertically and generally parallel to each other, respectively, from the work object itself or the installation surface on which the work object is installed.
The lower end of the ladder is supported by the installation surface, and the ladder can be tilted with the lower end as a fulcrum.
The ladder support unit
At least one flexible lateral rope that is open or closed so that it traverses the ladder behind it to reach or pass through the pair of stanchions. Supported by the pair of struts, each lateral rope has a length that is horizontal from the vertical reference plane as the ladder approaches from the lower end to the upper end of the ladder in side view. It is possible to hold the ladder in an inclined posture with respect to the vertical reference plane in a direction in which the directional distance becomes longer.
A pair of longitudinal ropes extending along each of the pair of struts, each lateral rope being loosely guided at any position in the longitudinal direction of each longitudinal rope, thereby each lateral direction. The vertical position where the rope contacts the pair of struts is loosely defined.
A ladder support unit that includes a pair of fixtures that secure the pair of vertical ropes to the pair of struts, respectively, at any relative position in the direction perpendicular to the struts.

(12) The path is a closed path and passes laterally through the ladder in a state of being in contact with the back surface of the ladder, and further passes laterally through the columns in a state of being in contact with the pair of columns. The ladder support unit according to item (11), further including a unit that passes the work object in the lateral direction in a state of being in contact with the back surface of the work object.

(13) The route is an open route, passes laterally through the ladder in a state of being in contact with the back surface of the ladder at the central portion of the route, and further, at the terminal positions on both sides of the route. The ladder support unit according to item (11), each of which is moored to the pair of columns.

(14) Each of the pair of vertical ropes has a ring having a through hole having a diameter larger than that of the rope (a loop made of the same material as the rope, or a ring-shaped metal fitting externally attached to the rope). At different positions in the length direction of each vertical rope, which is equal to or more than the number of at least one horizontal rope.
A portion of each lateral rope loosely passes through the corresponding ring of each longitudinal rope, in which state each lateral rope is brought into contact with the corresponding strut and its contact position is vertical. The ladder support unit according to item (13), which is loosely defined by the ring of each longitudinal rope so as to be variable within a predetermined range.

(15) The ladder support unit according to any one of (11) to (14), wherein the pair of fixtures are detachably mounted on the pair of columns without using separate mounting brackets. ..

(16) The ladder support unit according to item (15), wherein each of the pair of fixtures has a magnet and is detachably mounted on the surface of the pair of columns by the magnetic force of the magnet.

(17) The item (16), wherein the corresponding vertical rope is suspended from each fixture at the upper end position of each fixture in a state where each fixture is magnetically attracted to the surface of the corresponding support. Ladder support unit.

(18) The at least one lateral rope includes a plurality of lateral ropes that are different from each other in terms of vertical position, and the lateral ropes should be dropped from the ladder during the work by the operator. The ladder support unit according to any one of (11) to (17), which functions as a protective net for preventing the person from further falling.

(19) Further, in order to limit the horizontal movement of the lower end of the ladder, two ropes extending in the horizontal direction between the pair of columns or a closed rope wound around the pair of columns are included (11) to The ladder support unit according to any one of item (18).

(20) A ladder support unit that supports the ladder so that when the worker uses the ladder as a scaffold to work on the work object, the ladder is tilted in a direction away from the work object. There,
A pair of columns belonging to the work object or independent of the work object are arranged so as to be horizontally separated from each other along the work object in the vicinity of the work object in a plan view. Together, they extend generally vertically and generally parallel to each other, respectively, from the work object itself or the installation surface on which the work object is installed.
The lower end of the ladder is supported by the installation surface, and the ladder can be tilted with the lower end as a fulcrum.
The ladder support unit
At least one flexible first rope that is open or closed, passing laterally behind the ladder to reach the pair of stanchions or via those struts. As such, supported by the pair of struts, each first rope has a length, from the vertical reference plane as the ladder approaches from the lower end to the upper end of the ladder in side view. It is possible to hold the ladder in an inclined posture with respect to the vertical reference plane in a direction in which the horizontal distance of the rope becomes longer.
In the pair of struts, a support that supports each first rope so that the vertical position of each first rope is defined.
At least one second rope extending horizontally between the pair of struts in the vicinity of the installation surface, the lower part of the ladder by constant or temporary contact with the lower part of the ladder. A ladder support unit that includes one that prevents the ladder from laterally deviating from a predetermined range, thereby mechanically stabilizing the lower part of the ladder.

(21) The support is attached to a loop having the same number or more rings (for example, a loop made of the same material as the rope, or the rope) for each support. It has a third rope that has ring-shaped metal fittings, etc.) that are located in different length directions from each other, and the third rope is supported by each support so as to extend in the vertical direction.
The vertical position of each first rope in contact with each strut is loosely defined by routing each first rope loosely through any of the rings of each third rope. The ladder support unit according to item (20).

(22) The at least one first rope is coated with a synthetic resin, and the synthetic resin is used between the at least one first rope and the ladder and each of the pair of columns. The ladder support unit according to item (20) or (21), which increases the frictional force.

(23) Further, items (11) to (22) include a ladder lower part stabilizing portion that mechanically stabilizes the lower part of the ladder by mechanically restricting the horizontal movement of the lower part of the ladder during the work. The ladder support unit described in any of.

(24) The ladder lower part stabilizing portion is at least one horizontal lower rope supported by the pair of struts, and is the lower part of the ladder by constant or temporary contact with the lower part of the ladder. The ladder support unit according to any one of (11) to (22), which includes a device for preventing unscheduled horizontal movement of the ladder.

(25) Further, during work, the upper part of the ladder is supported generally horizontally forward from behind it, thereby mechanically limiting the backward tilt of the upper part of the ladder, thereby dynamics the upper part of the ladder. The ladder support unit according to any one of (11) to (24), which includes a ladder upper stabilizing portion for stabilizing the ladder.

(26) The ladder upper stabilizing portion includes at least one horizontal upper rope supported by the pair of columns, the horizontal upper rope being located above the horizontal lower rope, and the upper part of the ladder. The ladder support unit according to any one of (11) to (25), which supports the ladder horizontally and forward from behind it.

(27) A ladder support unit that supports the ladder so that when the worker uses the ladder as a scaffold to work on the work object, the ladder is tilted in a direction away from the work object. There,
During work, the upper part of the ladder is supported generally horizontally forward from behind it, thereby mechanically limiting the unplanned backward tilt of the upper part of the ladder from the target leaning position. A ladder upper stabilizer that dynamically stabilizes the upper part of the ladder,
Ladder support including a ladder lower stabilizer that mechanically stabilizes the lower part of the ladder by mechanically limiting unplanned deviations of the lower part of the ladder horizontally deviating from a predetermined area during work. unit.

(28) The ladder upper stabilizer comprises at least one horizontal upper rope that generally extends laterally, supported by a pair of struts that belong to or are independent of the work object. The horizontal upper rope prevents slipping relative to the ladder when the upper part of the ladder is horizontally forward from behind it and the frictional force generated with the ladder is large. The ladder support unit according to item (27), wherein when the frictional force is small, the ladder support unit prevents the unplanned backward tilt by supporting the ladder in a selective slip prevention state that allows relative slippage with respect to the ladder.

(29) The ladder lower stabilizing portion includes at least one horizontal lower rope supported by the pair of columns, the horizontal lower rope being located below the horizontal upper rope, and of the ladder. The ladder support unit according to item (27) or (28), which prevents unplanned deviation by constantly or temporarily contacting the lower portion.

According to the standing signboard system according to any one of (1) to (10) above, the standing signboard installed in the area can be tilted with respect to the support of the standing signboard, and further, according to the tilting posture of the standing signboard. The ladder is installed in a tilted position (so that it has a geometry or geometry similar to that of the sign), which provides a working space for workers between the tilted sign and the ladder. To.

As a result, according to this billboard system, workers can work at sites where signboards are installed (ie, even in areas where it is difficult to properly install ladders as scaffolding. , With the signboard installed in the area), a work space is secured for the work of changing the content of the information displayed by the signboard, and as a result, the worker can safely and securely change the work. It becomes possible to do.

According to the ladder support unit according to any one of (11) to (29) above, the ladder is installed in the tilted posture with respect to the work object (either the upright posture or the tilted posture), whereby the work is performed. A work space for workers is secured between the object and the ladder.

As a result, according to this ladder support unit, a work space for the worker to work on the work object is secured, and as a result, the worker can perform the work safely and securely. Become.

Further, according to this ladder support unit, the ladder is supported by a rope from behind, so that a work space for the worker to work on the work object is secured, and as a result, the worker can work on the work object. It is possible to carry out work safely and securely.

FIG. 1A is a perspective view showing a standing signboard according to an exemplary first embodiment of the present invention in a state where the display board is in an upright posture, and FIG. 1B is a perspective view showing the standing signboard. It is a perspective view which shows the layout at the time of change work which the display board is in a tilted posture, and the ladder used in combination with the standing signboard at the time of a change work is also in a tilted posture in the same direction. In FIG. 2A, since the standing signboard is installed near the boundary line on the site, the ladder cannot be installed at an appropriate position on the same site as a scaffolding for workers with a normal standing signboard. It is a side view showing the working environment of the above, and the figure (b) is because the standing signboard is installed near the fence installed near the boundary line on the site, so the normal standing signboard is for change work. It is a side view which shows the 2nd working environment which cannot secure the working space of an appropriate size. FIG. 3A shows the change work layout shown in FIG. 1B when the signboard according to the first embodiment is used together with the ladder in the first work environment shown in FIG. 2A. It is a side view for demonstrating that the necessary work space is secured between the display surface of a standing signboard and a ladder, and FIG. 3B is a view of a standing signboard according to the first embodiment together with a ladder. In the second work environment shown in 2 (b), if it is used in the change work layout shown in FIG. 1 (b), the necessary work space is secured between the display surface of the signboard and the ladder. It is a side view for demonstrating. FIG. 4 is a front view showing the signboard shown in FIG. 1 (a) in comparison with a worker having a height of 170 cm (1700 mm) together with related exemplary dimensions (unit: mm). is there. FIG. 5 shows a three-layer display plate of the signboard shown in FIG. 4, in which the face plate constituting the front layer is partially rolled up so that the hollow frame constituting the central layer thereof can be visually recognized. It is a perspective view which shows in the state. FIG. 6 is a partial cross-sectional front view showing a connecting structure in which one of the columns and both side portions of the frame shown in FIG. 5 facing the columns are connected to each other in the signboard shown in FIG. FIG. 7A typically shows one of the three sets of fasteners used to connect the columns and frames shown in FIG. 6 to each other at points H1, H2, H3, respectively, in a disassembled state. It is a perspective view, and FIG. 3B is a side view showing a state in which a female screw portion of the fastener shown in FIG. 3A is fastened to the display plate, and FIG. It is a front view which shows one through hole formed in one face plate of a display plate, and FIG. 3 (d) shows the two through holes formed in the other face plate of the display plate. It is a front view which shows. FIG. 8 is a partial side view for explaining that the support column and the display board shown in FIG. 6 can swing between the upright posture and the tilted posture. In FIG. 9 (a), as shown in FIG. 1 (b), the uppermost wire is connected to the point P1 of the column by the first connector, and the middle wire and the lowermost wire are both connected. It is a front view which shows the state of being connected to each of the points P2 and P3 of a support by the 2nd connecting tool, and FIG. 3B is the perspective view which shows the 1st connecting tool in the disassembled state. FIG. 3C is a perspective view showing the second connector in an exploded state. FIG. 10 is an enlarged plan sectional view showing the first connector shown in FIG. 9 (b) together with related exemplary dimension dimensions (unit: mm) and fastened to the corresponding column. is there. FIG. 11 is an enlarged plan sectional view showing a second connecting tool shown in FIG. 9 (c) in a state of being fastened to a corresponding support column and shown in an exemplary first layout. FIG. 12 is an enlarged plan sectional view showing a second connecting tool shown in FIG. 9 (c) in a state of being fastened to a corresponding support column and shown in an exemplary second layout. FIG. 13 (a) is a plan development view representatively showing one of the three wires shown in FIG. 1 (b), and FIG. 13 (b) shows the two columns of the vertical signboard. It is a side view which shows how the ladder is supported by the three wires which connected both ends in a tilting posture (backward leaning posture), and FIG. 3C is a plan view which shows the state. In FIG. 14, a ladder according to an exemplary second embodiment of the present invention, which itself is in an upright posture and is used in combination with the standing signboard at the time of changing work, is attached to the standing signboard. It is a perspective view which shows the layout at the time of change work which is connected in the horizontal unfolding posture at the intermediate position in the height direction. FIG. 15A shows FIG. 14 in the first working environment in which the ladder cannot be installed at an appropriate position on the same site as a scaffolding for workers because it is installed near the boundary line in the site. It is a side view showing a state in which a ladder is arranged horizontally so as to cross a boundary line with respect to a signboard to be shown, and a worker performs a change work in a standing posture on the ladder. FIG. In the second work environment, where it is not possible to secure a work space for change work in an appropriate size with a normal standing signboard because it is installed near the fence installed near the boundary line inside the figure. It is a side view which shows how the ladder is arranged horizontally with respect to the standing signboard shown in 14, and the worker performs the change work in a standing posture on the ladder. FIG. 16 is a side view showing how the ladder is horizontally arranged so as to cross the fence in the second working environment shown in FIG. 15 (b) with respect to the standing signboard shown in FIG. , At each end, fixed in a horizontal position via two wires extending from the sign. FIG. 17 (a) is a plan development view representatively showing any one of the plurality of wires shown in FIG. 16, and FIG. 17 (b) shows one wire shown in FIG. 16 (a). It is a front view which shows a plurality of constituent segments. FIG. 18A is a front view showing the ladder, and FIG. 18B is a plan view showing the ladder shown in FIG. 18A. FIG. 19A shows a side view of a ladder support unit according to an exemplary third embodiment of the present invention, together with a standing sign and a ladder, in which the standing sign is in an upright posture and the ladder is in a tilted posture. It is a figure, and FIG. 3B shows a state in which a rectangular work space is formed between the two when the standing signboard is in the tilted posture and the ladder is also in the tilted posture in the side view. It is a side view, and FIG. 3C shows a state in which a fan-shaped work space is formed between the two in a side view when the standing signboard is in an upright posture and the ladder is in a tilted posture. It is a side view which shows. FIG. 20 shows a state in which three lateral ropes having different height positions are routed so as to pass through each support in the ladder support unit shown in FIG. 19, and a vertical rope is attached to each support. It is a perspective view which shows the state that the horizontal rope and the vertical rope are connected to each other in each support. FIG. 21 is a plan view representatively showing any one of the three lateral ropes shown in FIG. 20. 22 (a) is a side view showing an enlarged view of the connecting unit constituting the middle ring shown in FIG. 20, and FIG. 22 (b) is a connection of the connecting units shown in FIG. 20 (a). It is a top view which takes out a tool and shows it enlarged. FIG. 23 is a perspective view showing the fixture shown in FIG. 20 taken out and enlarged. FIG. 24A is a side view for explaining the height adjusting mechanism of the vertical rope and the principle that the inclination angle of the ladder changes due to the vertical rope height adjusting mechanism in the ladder support unit shown in FIG. b) is a side view for explaining the length adjusting mechanism of each lateral rope in the same ladder support unit and the principle that the inclination angle of the ladder changes accordingly. FIG. 25A is a side view showing a good example in which a plurality of lateral ropes are used in the ladder support unit shown in FIG. 19, and FIG. 25B is a side view showing a plurality of ropes in the same ladder support unit. It is a side view which shows a bad example which the lateral rope of is used. FIG. 26A is a perspective view for explaining the principle that unplanned horizontal movement of the lower part of the ladder is restricted by two horizontal ropes parallel to each other in the ladder support unit shown in FIG. FIG. (B) is a side view. FIG. 27 shows a ladder support unit according to an exemplary fourth embodiment of the present invention, in which three lateral ropes different from each other in terms of height position are routed so as to be moored to each support column. It is a perspective view which shows the state in which the vertical rope is attached, and the state in which the horizontal rope and the vertical rope are connected to each other in each support. FIG. 28 (a) shows a plurality of examples of routes in which a lateral rope or wire is routed so as to connect a standing sign and a ladder to each other in the plurality of standing sign systems disclosed in the application documents. It is a plan view which shows one of them, the figure (b) is a plan view which shows another example, and the figure (c) is a plan view which shows still another example. FIG. 29 (a) shows, in the prototype of the ladder support unit shown in FIG. 19, the ladder is supported by a plurality of lateral ropes from behind the ladder in the horizontal forward direction and with each lateral rope without excessive deflection. FIG. 5 is a perspective view showing how each horizontal rope bends due to its own weight and how each horizontal rope makes point contact with a ladder and a pair of columns at a plurality of contact points. ) Is a plan view.

Hereinafter, some of the more specific exemplary embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]

First, a signboard system 10 according to an exemplary first embodiment of the present invention will be specifically described with reference to FIGS. 1-FIG. 13, FIG. 18 and FIG. 28.

<Summary explanation>

First, as shown in FIG. 1, the standing signboard system 10 is a self-standing type and a fixed installation type standing signboard 20 (an example of the work object and an example of the structure). Is also).

The signboard 20 is a pair of columns 22 and 22 fixed perpendicularly to a support surface of a site (an example of the area), and a display board sandwiched and supported from both sides by the columns 22 and 22. It is configured to include 30 (which will be described in detail later with reference to FIG. 5 and the like). The display board 30 may be horizontally long or vertically long. In the example shown in FIG. 4, the display board 30 is horizontally long.

As will be described in detail later, the display board 30 swings around the horizontal axis extending along the upper end portion of the display board 30 with respect to the pair of columns 22 and 22, whereby the vertical reference plane of the display board 30 (FIG. It is possible to tilt with respect to the surface of the display board 30 shown in 1 (a)). The structure for enabling the tilt will be described in detail later with reference to FIGS. 6-8.

The vertical signboard 20 is a double-sided display type, and therefore, the display board 30 has a front side (front side) display surface 32 and a rear side (rear side) display surface 32. The same or different information can be displayed on the display surfaces 32 and 32 on both sides of the display surface 32 and 32, respectively.

The information is represented by, for example, letters, numbers (see FIG. 4), and figures. The numbers may be composed of, for example, one number or a plurality of digits.

Here, each number may be represented by one symbol as a whole (see FIG. 4), or may be represented as a group of a plurality of symbols, that is, a plurality of number segments (for example, 7 segments).

When each number is represented by one symbol, the worker exchanges the whole of one number for another one number in units of one number (for example, one number). Work to change the information displayed on each display surface 32 by replacing or pasting one sheet representing a number with another (“work” performed by the worker on the work object) As an example.) May be performed.

Instead, if one number is configured as a 7-segment variable number, a collection of 7 segments, the worker may have one segment or one segment group (s). One segment or segment group is exchanged for another segment or segment group (for example, one segment or segment group) in units of a group of multiple segments adjacent to each other. The change work may be performed by replacing or pasting one sheet representing the group with another one.

The vertical sign system 10 further includes a ladder 40 used by the operator to manually change the information presented by the display board 30 for at least one of the display surfaces 32 and 32 on both sides. It is composed.

As illustrated in FIG. 4, with respect to the standing signboard 20, the information to be changed (including deletion and addition) is placed at a height exceeding the height of the worker, so that the changing work is performed by the worker. Manual work at a high place, that is, work while climbing the ladder 40 is required.

In the figure, "GL" is an abbreviation for ground level or ground line, which means the ground surface or the reference plane. Here, the "ground surface" is an example of the "support surface". This support surface may be a concrete surface or an asphalt surface instead of the ground surface.

An example of the ladder 40 is shown in FIGS. 18 (a) and 18 (b). The ladder 40 is a pair of vertical bars 42, 42 extending generally linearly, and a plurality of horizontal bars (step bars, horizontal bars, etc.) 44 supported at both ends by the vertical bars 42 and 42, which extend in parallel with each other. It is configured to include and.

The ladder 40 may be a single type, a telescopic type, or a foldable type. If the ladder 40 is foldable, it is advantageous in reducing the storage space during storage and improving portability.

Further, it is sufficient that the ladder 40 is installed at a position close to the standing signboard 20 at all times or as needed.

Further, in the present embodiment, it is possible to use a commercially available ladder as the ladder 40 as it is, that is, without making any special changes. On the other hand, in the planned contact area between the wire or rope and the ladder 40, which will be described later, a commercially available ladder is used after taking measures to mechanically prevent the wire or rope from coming off the ladder 40 unexpectedly. It may be used as a ladder 40.

FIG. 1A is a perspective view showing the standing signboard 20 in a state where the display board 30 is in an upright posture. On the other hand, FIG. 3B is a perspective view showing the standing signboard 20 in a changing work layout in which the display board 30 is in a tilted posture and the ladder 40 is also in a tilted posture in the same direction.

In the change work layout, the ladder 40 is rearwarded by a plurality of (eg, three) wires 50, 50, 50 (later detailed with reference to FIG. 13) extending horizontally from the standing sign 20. The tilt limit position (the limit position where the ladder 40 tilts due to its own weight and the weight of the operator. The backward tilt limit position. The maximum backward tilt angle. For example, about 20 degrees) is supported so as to be defined. The structure in which the wires 50, 50, 50 are supported by the vertical sign 20 will be described in detail later with reference to FIGS. 9-12.

Here, each wire 50 is an example of the "rope" and is formed by twisting a plurality of steel strands (steel wires). Instead of this, for example, the "rope" Another example, in which a plurality of synthetic fiber strands (for example, synthetic resin strands) are twisted together may be used. Further, each wire 50 constitutes an example of the "first rope".

By the way, as shown in FIG. 2A, in general, since the standing signboard is installed near the boundary line in the site, the ladder is placed at an appropriate position in the same site as a scaffolding for the worker in the normal standing signboard. There is a first working environment that cannot be installed.

Further, as shown in FIG. 3B, since the standing signboard is generally installed near the fence installed near the boundary line on the site, the normal standing signboard is a work space for changing work. There is also a second working environment in which it is not possible to secure an appropriate size.

On the other hand, as shown in FIG. 3A, the standing signboard 20 according to the present embodiment is used together with the ladder 40 in the first working environment shown in FIG. 2A during the changing work shown in FIG. 1B. When used in the layout, the necessary work space is secured between the display surface 32 of the vertical signboard 20 and the ladder 40, and the worker can work in a posture of leaning against the ladder on his back.

Further, as shown in FIG. 3 (b), if the vertical signboard 20 is used together with the ladder 40 in the second work environment shown in FIG. 2 (b) in the layout at the time of change work shown in FIG. 1 (b). The necessary work space is secured between the display surface 32 of the signboard 20 and the ladder 40 in a state where the geometrical restrictions imposed by the fence are alleviated.

<Explanation of structure>

1. 1. Overall structure of the signboard

FIG. 4 is a front view showing the standing sign 20 with a number (unit: mm) representing the relevant exemplary dimensions and in contrast to an operator having a height of 170 cm (1700 mm). In some other drawings, numbers (units: mm) representing the relevant exemplary dimensions are added to represent the reality of the vertical sign 20 and the vertical sign system 10.

As shown in the figure, the work for changing the information (for example, numbers) displayed on the display board 30 exceeds a position higher than the height of the worker on the ground (for example, about 2 m above the support surface). This change work is classified as a height work because it is performed for a position with height).

As shown in the figure, since the display board 30 is arranged at a high place in the standing signboard 20, the worker is required to work at a high place for the change work. Therefore, it is important for the worker how to properly use the ladder 40 as a scaffold.

By the way, as will be described in detail later, the operator is required to tilt the display board 30 prior to the change work, and the weight of the display board 30 is about 10 kg.

Further, in the example shown in the figure, one number displayed on the display board 30 is as large as 900 mm in height, so that the operator can use the ladder 40 at a high place. Since a rather complicated work is required, such as handling a relatively large object (for example, the above-mentioned sheet) mainly with one hand, the ladder 40 is also required to be firmly fixed so as not to move unnecessarily. ..

2. Display board structure

As shown in FIG. 5, the display plate 30 is of a three-layer type, and includes a face plate 50 forming a front layer having a front display surface 32, a face plate 50 forming a rear layer having a rear display surface 32, and a face plate 50. It has a sandwich structure with a hollow frame 56 forming a central layer between them. In the figure, for convenience of explanation, the front face plate 50 is partially rolled up in order to make the frame 56 visible.

As shown in the figure, the frame 56 has a plurality of hollow portions penetrating in the plate thickness direction of the frame 56 in order to reduce the weight while ensuring the required rigidity.

As shown in FIG. 6, the vertical signboard 20 has a connecting structure (connecting mechanism) 60 for connecting one of the columns 22 and both side portions of the frame 56 facing the columns 22.

As will be described in detail later, this connecting structure 60 is a state in which the columns 22 and the frame 56 are strongly connected so that the frame 56 is substantially immovable with respect to the columns 22 (non-swingable state, immovable). The state) and the frame 56 are loosely connected to the support column 22 so as to be swingable (swingable state, movable state).

The support column 22 is a standard product, and is selected from a plurality of standard products of the same type. Specifically, the column 22 is made of a hollow steel square timber having a square cross section. The strut 22 is made of a magnetic material and is therefore attractable by a magnet. One side of the cross section of the support column 22 is, for example, 75 mm. The upper end of the opening of the support column 22 is closed by the cap 62. Similarly, the frame 56 is also made of hollow steel square timber having a square cross section. One side of the cross section of the frame 56 is, for example, 32 mm.

3. 3. Connection structure between the support and the display board

As shown in the partial cross-sectional front view in FIG. 6, the connecting structure 60 has three points H1 (uppermost position) having different height positions at the side portions of the support column 22 and the frame 56 facing each other. , H2 (middle position) and H3 (bottom position), respectively, to have three sets of fasteners 70, 70, 70 corresponding to the three connection positions H1, H2, H3. The fasteners 70 have a structure common to each other, and each of the fasteners 70, 70, 70 has a bolt 72 as a male thread portion and a female thread portion 74.

As shown in FIG. 7A, the connecting structure 60 is configured as a combination of a plurality of mechanical parts, but each part is not a dedicated product but a standard product, and each part is a plurality of standard products of the same type. It is selected from among them for a specific purpose described later.

In FIG. 6A, any one of the three sets of fasteners 70, 70, 70 is typically shown in a disassembled state. The bolt 72 has a head portion 76 and a male thread portion 78. The head 76 has an outer peripheral surface having a hexagonal cross section. The bolt 72 is also a standard product.

As shown in FIG. 6, the bolt 72 penetrates the support column 22 in the thickness direction with the head portion 76 exposed from the outer surface 80 of the support column 22, and the tip portion of the male screw portion 78 is from the inner surface 82 of the support column 22. It is protruding. The protruding portion 84 enters the internal space from the outer surface 86 of the frame 56, penetrates it in the thickness direction, and eventually protrudes from the inner surface 88 of the frame 56 into the hollow portion 90.

As shown in FIG. 7A, the female threaded portion 74 has a nut 100 that is screwed into the bolt 72. The nut 100 has an outer peripheral surface having a hexagonal cross section. Its outer peripheral surface has three pairs of parallel surfaces. Therefore, the nut 100 has a width across flats.

In order for the operator to tighten and fix the support column 22 to the frame 56 with the bolt 72 and the nut 100, the operator rotates the bolt 72 and screwes it into the nut 100. At this time, in order to prevent the nut 100 from rotating as the bolt 72 rotates, the nut 100 may be collectively referred to as a U-shaped bolt (may be a U-shaped bolt or also a C-shaped bolt) as a rotation prevention member. 102 is attached.

The U-bolt 102 has a pair of shaft portions (a pair of parallel portions, a pair of straight portions) 104 and 104 extending in parallel with each other from one base end portion (for example, a curved portion) 103. A screw 106 is formed at the tip of each shaft portion 104.

Like the nut 100, the U-shaped bolt 102 is also a standard product, but as the U-shaped bolt 102, the width of the clearance between the inner surfaces of the pair of shaft portions 104 and 104 from among a plurality of standard products of the same type (this is , Determined by the combination of the pitch and screw diameter of the U-bolt 102), but slightly longer than the width across flats of the preselected nut 100 (eg, the nut 100 cannot start rotating within the U-bolt 102). Or, a nut (length that cannot continue to rotate) is selected (see Fig. (B)).

As shown in FIG. 3B, when the nut 100 is surrounded (sandwiched) by the selected U-bolt 102, the nut 100 is prevented from rotating unnecessarily in the U-bolt 102. The U-bolt 102 is fixed to the display board 30 as described later. Therefore, when the bolt 72 is screwed into the nut 100, the U-shaped bolt 102 prevents the nut 100 from rotating around.

In order to prevent the nut 100 and the U-shaped bolt 102 from being separated unnecessarily, it is desirable to bond them to each other by adhesion, welding, spacers, or the like.

As a result of the nut 100 trying to rotate in the U-shaped bolt 102 while tightening the bolt 72, the bending moment in the direction of widening the distance between the pair of shaft portions 104 and 104 of the U-shaped bolt 102 and expanding the pitch. Is generated in the pair of shaft portions 104 and 104, respectively.

In order to prevent the pitch of the U-bolt 102 from expanding despite the generation of the bending moment, the pair of shaft portions 104 and 104 have a common connecting member (tie bar, connecting bar, etc.). May be connected to each other by.

As an example of the connecting member, as shown in FIG. 7A, two through holes in one flat plate common to the pair of shaft portions 104 and 104 substantially match the pitch of the U-shaped bolt 102. The two-hole plates 108 are arranged at the same pitch. This 2-hole plate 108 is also a standard product.

In the present embodiment, as shown in FIG. 3B, the two-hole plate 108 has a nut 100 in the U-bolt 102 in the length direction thereof (direction parallel to the shaft portion 104, U-bolt 102). It also has a function of preventing unplanned linear movement (for example, unplanned departure) in the height direction.

As shown in FIG. 3B, the U-shaped bolt 102 is tightened and fixed to the display plate 30 while holding the nut 100 inside. Specifically, a through hole (through hole) 120 is formed as an elongated hole in one of the face plates 50 and 50 on both sides of the display plate 30 (the face plate 50 on the right side in the figure). The through hole 120 is displayed with the U-shaped bolt 102 attached to the two-hole plate 108 and passing through the face plate 50 in the thickness direction with the pair of shaft portions 104 and 104 at the head. Allows entry into the interior of the plate 30.

In the face plate 50 on the opposite side (the face plate 50 on the left side in the figure), a pair of through holes 122 and 122 for passing the pair of shaft portions 104 and 104 are formed as circular holes (or elongated holes), respectively. There is. The pitch between the pair of through holes 122 and 122 is chosen to substantially match the pitch of the U-bolt 102.

The washer 124 and the nut 126 are attached to the portions of the pair of shaft portions 104 and 104 that are exposed from the opposite face plate 50, respectively. By rotating the nut 126, the nut 126 is tightened to the U-bolt 102 via the washer 124, whereby the U-bolt 102 is fixed to the face plate 50. As a result, the nut 100 in the U-bolt 102 is prevented or restricted from rotating with respect to the display plate 30.

In this tightened state, the nut 100 is sandwiched between the two-hole plate 108 and the base end 103 of the U-bolts 102, whereby the nut 100 moves in the length direction of the U-bolts 102. Is effectively blocked.

In the above description, the 2-hole plate 108 is selected from the same type of standard products so as to have both a function of preventing the U-bolt 102 from unplanned expansion and a function of a washer. However, if the bending rigidity of the U-bolt 102 is sufficiently high, the U-bolt 102 is selected from a plurality of standard products of the same type so that the former function is omitted and only the latter function is realized. You may.

As shown in FIG. 6, the combination of the bolt 72 and the nut 100 tightens the strut 22 on one side and one side of the frame 56 at three points H1, H2, and H3, whereby the strut The 22 and the display board 30 are firmly connected so as not to move. This connection is also performed for the support column 22 on the opposite side of the vertical signboard 20 and the other end of the frame 56. As a result, the upright posture of the display board 30 is achieved.

It should be noted that each bolt 72 may be tightened not directly to the corresponding support column 22 but via a washer (not shown).

On the other hand, in order to achieve the tilted posture of the display board 30, at points H2 and H3, by loosening the bolt 72, the bolt 72 is removed from the nut 100 while leaving the nut 100, and further, the bolt 72 is removed from both the frame 56 and the support column 22.

Further, at point H1, the bolt 72 is loosened without being removed from the nut 100. Then, as shown in FIG. 8, the display plate 30 can swing with respect to the support column 22 around the axis of the bolt 72 (around the horizontal axis along the upper end of the display plate 30). At this time, the swingable state is realized.

When the display plate 30 swings to the target angle θ with respect to the vertical reference surface of the vertical signboard 20 (the surface of the display plate 30 in the upright posture), when the bolt 72 is tightened to the nut 100 at the point H1, the display plate 30 30 is fixed in a tilted posture with respect to the support column 22 at a target angle θ. At this time, the non-swingable state is realized.

Of the display surfaces 32 and 32 on both sides of the display board 30, when it is necessary for the operator to change the display information of the display surface 32 on the rear side (back side), for example, the display board 30 The display board 30 is tilted so that the lower end of the site approaches the center of the site (see FIGS. 3A and 3B). In this tilted posture, the operator changes the display information on, for example, the display surface 32 on the rear side (back side) of the display surfaces 32 and 32 on both sides of the display board 30.

As described above, in the present embodiment, the fastener 70 attached to the point H1 that switches between the swingable state and the non-swingable state is the fastener 70 of the support column 22 and the frame 56. Together with the related parts, an example of the "display board connector" and an example of the "display board fixture" are configured.

In the present embodiment, an example of the "display plate connector" and an example of the "display plate fixture" are configured as a fastener 70 as a unit common to them, but as a plurality of individual units. It may be configured as a plurality of individual units that are partially common but partially different.

4. Connection structure between columns and wires

As shown in FIG. 1 (b), in the change work layout, as described above, the ladder 40 has a plurality of (for example, three) wires 50, 50, 50 extending generally horizontally from the vertical signboard 20. Supports the ladder 40 so as to define a rearward tilt limit position (a position at which the ladder 40 tilts backward due to its own weight and the weight of the operator).

Therefore, the vertical signboard system 10 further has a connecting structure 200 for connecting the uppermost wire 50, the middle wire 50, and the lowermost wire 50 to the two columns 22 and 22 of the vertical signboard 20. By this connecting structure 200, both ends of each wire 50 are connected to the two columns 22 and 22, respectively.

As shown in FIG. 9A, the uppermost wire 50 is connected to the two columns 22 and 22 by the first connector 210 at the point P1. Further, both the middle wire 50 and the bottom wire 50 are connected to the two columns 22 and 22 by the second connector 220 and 220, respectively, at points P2 and P3, respectively. The connecting structure 200 is configured to include these three connecting tools 210, 220 and 220.

Similar to the above-mentioned connection structure 60, the connection structure 200 is configured as a combination of a plurality of mechanical parts as shown in FIG. 9, but all the parts are not dedicated products but standard products, and each part is a standard product. It is selected from a plurality of standard products of the same type for a specific purpose described later.

Both the first connector 210 attached to the point P1 and the second connector 220 commonly used for the points P2 and P3, respectively, basically do not require any additional processing on the corresponding column 22. The strut 22 is configured to be fixed to the strut 22 by the frictional force between the connectors 210, 220 and the strut 22 by mechanically compressing the strut 22 by simply surrounding the outer peripheral surface. To.

However, as shown in FIG. 9A, of the columns 22 on one side, at point P1, the outer peripheral surface of the columns 22 is not exposed (discontinuous) at the connecting portion with the display plate 30, and the other columns. Is not exposed all around (see FIG. 10), such as being exposed (continuous), whereas at points P2 and P3, the outer peripheral surface of the support column 22 is exposed all around. (See FIG. 11).

Therefore, in the present embodiment, in view of the location dependence of the exposure situation, at the point P1, the first connector 210 is generally U-shaped (the outer line of the quadrangle is one side thereof) in a plan view. The support column 22 is formed all around the support column 22 so that physical access to the support column 22 of the display board 30 is permitted at the open side. It is configured to partially surround, but not to, squeeze the stanchions 22.

On the other hand, at points P2 and P3, the common second connector 220 is configured to form a generally quadrangular shape in a plan view, surround the support column 22 all around, and press the support column 22. Will be done.

5. Structure of the first connector

Specifically, first, as shown in FIG. 9B, the first connector 210 is a U-shaped bolt 230, which is a pair of shaft portions 232 and 232 parallel to each other and one end thereof. It is provided with a linear base end portion 234 that connects the two to each other on the same side.

In the present embodiment, the base end portion 234 is configured to generally form a straight portion 254, whereby the area in which the base end portion 234 contacts the outer surface 80 of the column 22 as shown in the cross-sectional view in FIG. CA1 is increased, and accordingly, the frictional force generated between the U-shaped bolt 230 and the support column 22 at the time of compression is effectively increased. However, if it is not necessary to increase the frictional force, the base end portion 234 may be configured to generally form a curved portion (for example, instead of a U-shaped bolt).

As shown in the figure, the width dimension W of the clearance between the inner surfaces of the pair of shaft portions 232 and 232 (hereinafter, referred to as “inner surface clearance”) (this is the pitch P and the screw diameter d of the U-shaped bolt 230). (Determined by the combination with) and the length dimension L of the U-shaped bolt 230 is the first among a plurality of standard products of the same type so as to match the cross-sectional dimension (width dimension and depth dimension) of the support column 22. The connector 210 is selected.

As a result, the selected first connector 210 has an inner surface clearance having a width dimension W appropriately wider than the width dimension of the strut 22, and has a length dimension L longer than the depth dimension of the strut 22.

As shown in the upper part of FIG. 9, the U-shaped bolt 230 approaches the outer surface 80 of the support column 22 generally horizontally with the pair of shaft portions 232 and 232 at the head, and further advances in the same direction to advance the pair of shafts. The columns 22 are sandwiched between the portions 232 and 232 from both sides in the width direction. The advance limit of the U-shaped bolt 230 is defined by the base end portion 234 coming into contact with the outer surface 80 of the support column 22.

At the forward limit position, the respective tip portions (male screw portions) of the pair of shaft portions 232 and 232 project inward from the inner surface 82 of the support column 22.

The first connector 210 further includes two nuts 240 and 240 mounted on the protruding ends of the pair of shafts 232 and 232, respectively, and two small diameter washers 242 and 242.

By the way, the present inventor attaches the U-shaped bolt 230 to the support column 22 so as to surround it, and in that state, two nuts 240 and 240 are attached to the pair of shaft portions 232 and 232 of the U-shaped bolt 230. Was screwed through the small diameter washers 242 and 242, and when the U-shaped bolt 230 was retightened with the nut 240, the pair of shaft portions 232 and 232 were separated from each other in opposite directions (expanded, divergent). I noticed that it started to bend.

As a result, the present inventor has noticed that the pair of shafts 232 and 232 escape laterally from the stanchions 22 and eventually the shafts 232 and 232 tend to separate from the stanchions 22.

Therefore, as shown in FIG. 10, the present inventor reselected the U-shaped bolt 230 so that a slightly wider clearance is formed between the pair of shaft portions 232 and 232 and the support column 22. Then, it was proposed that a slightly larger sleeve 250 be attached to each shaft portion 232, and that a large diameter washer 252 is interposed between the small diameter washer 242 and the sleeve 250.

The sleeve 250 is selected so as to have a length that does not exceed the straight portion 254 of the corresponding shaft portions 232, as shown in FIG. 10, but the sleeve 250 exceeds the straight portion 254 and is a curved corner portion. It may be selected to have a length that partially penetrates 256.

In the present embodiment, as shown in FIG. 10, due to the addition of the large-diameter washer 252, a region of the inner surface 82 of the support column 22 that is not covered by the display plate 30 and in which the axial force of the nut 240 is transmitted. The area, that is, the area of the region CA2 in contact with the large-diameter washer 252 was increased as compared with the case where only the small-diameter washer 242 was used as the washer, thereby increasing the frictional force between the large-diameter washer 252 and the support column 22.

As a result, even if the U-shaped bolt 230 was tightened with the nut 240, the pair of shaft portions 232 and 232 were prevented from bending in the expanding direction due to the increased frictional force. If the large-diameter washer 252 is added, the small-diameter washer 242 can be omitted.

Further, with the addition of the sleeve 250, the tendency of the large diameter washer 252 to tilt with respect to the corresponding shaft portion 232 is reduced compared to when the sleeve 250 is not used. In the absence of the sleeve 250, the tilt limit of the large washer 252 is defined only by the contact between its inner diameter and the outer diameter of the shaft 232, whereas in the presence of the sleeve 250 This is because the tilt limit of the large-diameter washer 252 is effectively defined by the contact with the end surface of the sleeve 250 (a circle having a diameter larger than the outer diameter of the shaft portion 232).

As a result, the axial force of the nut 240 was more effectively transmitted to the strut 22, thereby further increasing the frictional force between the large diameter washer 252 and the strut 22.

As shown in FIG. 10, when the first connector 210 is attached to the point P1 of the support column 22, some gaps 256 are formed between the U-shaped bolt 230 and the support column 22. The gap 256 may be used as a connecting hole to connect the corresponding wire 50 to the strut 22.

Instead of or in addition to this, a gap (not shown) is intentionally formed between the base end portion 234 of the U-shaped bolt 230 and the outer surface 80 of the support column 22, and the gap is used as a connecting hole. The corresponding wire 50 may be connected to the support column 22.

6. Structure of the second connector

As shown in FIG. 9C, the second connector 220, like the first connector 210, has a U-shaped bolt 230, two nuts 240, and two small-diameter washers 240. Further, unlike the first connector 210, it has a two-hole plate 260 for connecting a pair of shaft portions 232 and 232 of the U-shaped bolt 230 to each other in the vicinity of their respective ends.

As shown in the lower part of FIG. 9, the U-shaped bolt 230 approaches the outer surface 80 of the support column 22 generally horizontally with the pair of shaft portions 232 and 232 at the head, and further advances in the same direction to form a pair. The support column 22 is sandwiched between the shaft portions 232 and 232 of the above from both sides in the width direction. The advance limit of the U-shaped bolt 230 is defined by the outer surface 80 of the support column 22 coming into contact with the base end portion 234.

At the forward limit position, the respective tip portions (male screw portions) of the pair of shaft portions 232 and 232 project inward from the inner surface 82 of the support column 22. A two-hole plate 260 common to them is attached to the protruding ends. As a result, the support column 22 is surrounded by the second connector 220 all around at points P2 and P3.

At this time, since the two-hole plate 260 comes into contact with the inner surface 82 of the support column 22, a frictional force is also generated between the two-hole plate 260 and the support column 22, and this point is different from that of the first connector 210. Is different.

As shown in FIG. 11, for the second connector 220, two nuts 240 and 240 and two small diameter washers 242 and 242 are provided at the protruding ends of the pair of shaft portions 232 and 232, respectively. It is installed. The nut 240 tightens the U-shaped bolt 230.

As shown in the figure, when the second connector 220 is attached to the points P2 and P3 of the support column 22, some gaps 262 are formed between the U-shaped bolt 230 and the support column 22. The gap 262 may be used as a connecting hole to connect the corresponding wire 50 to the strut 22. The gap 262 is formed between each shaft portion 232 and each side surface of the support column 22, for example, as shown in FIG.

In the example shown in the figure, the U-shaped bolt 230 approaches the outer surface 80 of the support column 22 generally horizontally with the pair of shaft portions 232 and 232 at the head, and further advances in the same direction. The support column 22 is sandwiched between the pair of shaft portions 232 and 232 from both sides in the width direction. The advance limit of the U-shaped bolt 230 is defined by the base end portion 234 coming into contact with the outer surface 80 of the support column 22.

On the other hand, in the example shown in FIG. 12, the access direction of the second connector 220 to the support column 22 is opposite to that in the example shown in FIG. Specifically, the U-shaped bolt 230 generally approaches horizontally toward the inner surface 82 of the support column 22 with the pair of shaft portions 232 and 232 at the head, and further advances in the same direction to advance the pair of shaft portions 232. The column 22 is sandwiched between the and 232 from both sides in the width direction. The advance limit of the U-shaped bolt 230 is defined by the base end portion 234 abutting on the inner surface 82 of the column 22.

7. Wire structure and usage examples

In FIG. 13A, one of the three wires 50, 50, 50 shown in FIG. 1B is typically shown in the front view. Each wire 50 is composed of one wire rope 300 (for example, a stranded steel wire), both ends of which form a loop 302, and the end of each loop 302 is fixed to the wire rope 300 with a clip 304. ing. Each loop 302 is moored to the first and second couplers 210 and 220, as shown in FIGS. 9 (b) and 9 (c) and FIGS. 10-12.

As an additional note, although not shown, at least one of the three wires 50, 50, 50 is configured to have a length adjusting mechanism such as the turnbuckle 430 shown in FIG. The wires 50, 50, 50 may also be configured to have a length adjusting mechanism.

The operator uses this kind of length adjustment mechanism (a metal fitting other than the turnbuckle, hardware, or mechanism may be used) to adjust the total length of each wire 50 to the inclination angle θ of the ladder 40 (distance angle from the vertical reference plane in the side view). (See FIG. 19)) When appropriately adjusted according to the target value, the wires 50, 50, 50 support the ladder 40 from behind, as illustrated in FIGS. 13 (b) and 13 (c). In, none of the wires 50, 50, 50 has slack and is maintained in a tension state (force transmission state, load state, action state, etc.).

In this case, each of the wires 50, 50, 50 dynamically and effectively supports the ladder 40, and as a result, bears the load from the ladder 40 in the state where the operator is climbing in a distributed state. Therefore, it is possible to prevent an excessive load from being generated only on one of the wires 50, thereby improving safety and reliability when performing work using the ladder 40.

However, in the present embodiment, in order to improve the safety factor of the vertical sign system 10, the load capacity of each wire 50 is the weight of the ladder 40 with only one wire 50 in the used state, and the worker who climbs and works on it. The weight of the wire and the weight of the three wires 50, 50, 50 are set to be supported.

It should be noted that each wire 50 theoretically extends exactly linearly as shown in FIGS. (B) and (c), but in reality, due to the weight of each wire 50 itself, FIG. 29 will be described later. As described in detail with reference to, each wire 50 (indicated by “520” in the figure) sags so as to be curved downward. This slack will be described in detail later, but the presence of the slack does not change the function and mechanical principles of each wire 50 as described above.

By the way, the larger the inclination angle θ of the ladder 40, the larger the size of the work space formed between the vertical signboard 20 and the ladder 40. On the other hand, the larger the worker's physique (body size, for example, fat or thin), the larger the size of the work space required for the worker. Therefore, the physique of the worker exists as one of the factors that determine the target value of the tilt angle θ.

13 (b) and 13 (c) are side views and plan views, respectively, in which the ladder 40 is supported in a tilted posture by three wires 50, 50, and 50 whose ends are connected to each support column 22 of the vertical signboard 20. It is shown how it is done.

The wires 50, 50, 50 extend from points P1, P2, and P3, which are different in height position from each other on the same vertical reference plane of the support column 22, in a posture of descending generally horizontally or as the distance from the support column 22 increases. Therefore, in order to realize the posture in which the ladder 40 is tilted with respect to the support column 22, the wires 50, 50, and 50 have different overall lengths.

By the way, as shown in FIGS. 13 (b) and 13 (c), the required lengths of the three wires 50, 50, 50 are different from each other due to the difference in the length of the path around which each wire 50 is routed. Further, as described above, the required length of each wire 50 varies depending on the physique and preference of the worker, but there is a statistical standard value for each wire 50 having a different height position. Further, the target value of the length required for each wire 50 for each worker can be finally finely adjusted by using the above-mentioned length adjusting mechanism.

In particular, in the present embodiment, as will be described in detail later with reference to FIG. 26, when the operator works on the vertical signboard 20 using the ladder 40, the lower end of the ladder 40, that is, the ladder 40 A rotation fulcrum or pivot point when tilting in a vertical plane is formed between a pair of columns 22 and 22 in a rectangular restricted area directly below the standing signboard 20 in an upright position, that is, in a plan view. Horizontal deviations from the rectangular cross-section pocket are prevented.

The rectangular area, or pocket, is defined by the inner surfaces 82, 82 of the pair of struts 22, 22, respectively, and two horizontal ropes 540, 540 extending horizontally and in parallel between them.

Therefore, in the present embodiment, the pair of columns 22, 22 and the two horizontal ropes 540, 540 form a part of the "ladder support unit" in the vertical signboard system according to the above (1). Further, an example of the "ladder lower part stabilizing unit" in the ladder support unit according to the above (23) is configured.

Thanks to this ladder lower stabilizing portion, in the present embodiment, the horizontal position of the rotation fulcrum (contact point with the support surface) of the ladder 40 during the work is the external force acting on the ladder 40 from the operator and the external force thereof. It stabilizes against external forces other than (strong winds, collisions with other objects, external forces that act accidentally due to collisions with other workers, etc.). This provides the ladder 40 with mechanical stability as a scaffold during work.

Thanks to the above-mentioned ladder lower stabilizing portion, in the present embodiment, the standard length of each wire 50 is further highly dependent on two factors, the vertical position of each wire 50 and the tilt angle θ of the ladder 40. Instead, the dependence of the rotation fulcrum of the ladder 40 on the horizontal position in the lateral view becomes so weak that it can be ignored, for example.

Therefore, the standard length of each wire 50 is reduced by the amount that the operator has to fine-tune the effective length of each wire 50 in actual use in the field, thereby for fine-tuning. The burden on the worker is reduced.

Therefore, in the present embodiment, assuming that the rotation fulcrum of the ladder 40 is on the center line of the rectangular region, the standard value LA of the length of the upper wire 50 passing through the point P1 and the point P2 are set. A standard value LB for the length of the middle wire 50 passing through and a standard value LC for the length of the lower wire 50 passing through the point P3 are selected.

In addition, regardless of which worker the wire set that will be used by any worker will actually be used, the wire set will be used by the worker prior to heading to the site. With each length adjusting mechanism in the neutral state, the upper wire 50 is prepared so that its length is equal to the standard value LA, and the middle wire 50 is prepared so that its length is equal to the standard value LB. And the lower wire 50 is prepared so that its length is equal to the standard value LC.

In one example, identification means (eg, different colored tapes, different colored marks, different symbols, etc.) are attached to the wires 50, 50, 50, respectively, to facilitate visual identification.

Therefore, a person arbitrarily appointed as a worker at the site this time from among a plurality of workers can use the length adjusting mechanism for each wire 50 in the actual site to obtain the length adjusting mechanism. Achieves an effective wire length that suits the worker's own physique and taste within a range that does not exceed the maximum adjustment amount (for example, 100-200 mm), and eventually a tilt angle θ (for example, 10 degrees or less, 20 degrees or less) of the ladder 40. It becomes possible to do.

The worker climbs on the upper surface of the tilted ladder 40, and in some cases, rests his / her back on the upper surface to stabilize his / her posture. The worker changes the display surface 32 in that posture. In FIG. 6C, for convenience of explanation, a plurality of cross rails 44 are omitted in the ladder 40.

As shown, the backward tilt limit of the ladder 40 is defined by those wires 50, 50, 50. As a result, the wires 50, 50, 50 prevent the operator from unplanned backward tilting or falling from a high place. As a result, the worker can safely and securely carry out the change work at a high place. The wires 50, 50, 50 cooperate with each other to function as a protective net for the operator.

As described above, in the present embodiment, the three wires 50, 50, 50, together with the corresponding first connecting tool 210 and the second connecting tool 220, are of the "ladder support unit". It constitutes an example.

As an additional note, a plurality of wires 50, 50, 50 are used as a plurality of weft threads, and a plurality of warp threads are combined with the weft threads so as to intersect them to form a net-like or lattice-like shape. , The net may be configured. In this case, the net itself will be used as a scaffolding for workers. This net will function as a flexible two-dimensional ladder in which the path the worker climbs is omnidirectional.

<First effect of supporting the ladder by the frictional force with the rope>

In the present embodiment, the surface of each wire 50, the surface of the vertical signboard 20 (particularly, the outer surfaces 82 and the back surface of the pair of columns 22, 22) and the surface of the ladder 40 (particularly, the back surface of the pair of vertical bars 42, 42). When each of) comes into contact with each other, a drag force is generated as a normal component at the interface between the two, and a frictional force is generated as a tangential component at the interface according to the drag force.

Both the drag force and the frictional force are in a light load state (standby state, relaxed state, light tension state) in which the ladder 40 is supported by three wires 50 with a small tension when the operator is not on board. Is small, and is large in a heavy load state (used state, tension state, severe tension state) in which the ladder 40 is supported by three wires 50 with a large tension while the operator is riding. Therefore, both the drag force and the frictional force depend on the type of load state of each wire 50.

Then, in the light load state, since the frictional force is small, the operator overcomes the frictional force in order to change (position, rearrange) the position or angle of each wire 50 or ladder 40, for example. With only a small force applied, each wire 50 and each of the standing sign 20 and the ladder 40 are allowed to slide relative to each other in any direction.

On the other hand, in a heavy load state, the frictional force is large (larger than the assumed disturbance), so that each wire 50 and each of the vertical signboard 20 and the ladder 40 are relatively planned in either direction. Slip out is suppressed.

Thus, thanks to the dependency between the frictional force and the type of load condition, the slip is automatically allowed when the operator desires it and prevented when it is not. Slip.

The frictional force does not have directivity, and specifically, each wire 50 and the vertical sign 20 (to be exact, a component in which each wire 50 contacts among a plurality of parts of the vertical sign 30, particularly a pair of columns When there is a large drag between each of 22, 22) and the ladder 40, frictional forces are generated in each of the wires 50 in the vertical, horizontal and diagonal directions, while being negligible. When there is only a small drag force, the frictional force is selectively generated according to the drag force, such that the frictional force is not generated in either direction.

Therefore, while the worker is climbing the ladder 40 and working, an effective frictional force is generated omnidirectionally, so that each wire 50 and the ladder 40 are locked (fixed) and each wire. The 50 and the pair of columns 22, 22 are locked, whereby the wires 50 are prevented from being displaced vertically or horizontally from the vertical sign 20 and the ladder 40.

As a result, from the viewpoint of the worker who is climbing the ladder 40 and working, even if the worker himself moves a little, the movement and the wobbling linked to the movement do not occur in the ladder 40, and therefore the ladder 40 is mechanically stable. As a result, the worker can continue the work in a stable posture.

In this embodiment, each wire 50 is coated with a synthetic resin. When the ladder 40 is supported by the synthetic resin-coated wire 50, a larger frictional force is applied to the surface of each wire 50, the surface of the vertical sign 20 and the ladder 40 than when the uncoated wire 50 is used. Occurs between each of the surfaces of the.

However, the present invention can also be carried out in a manner in which each wire 50 is not coated with a synthetic resin, and in this embodiment, the frictional force is applied to the surface of each wire 50, that is, the metal surface (the surface of the steel strand). A mode in which the surface of the vertical bars 42, 42 of the ladder 40 (which may be a metal surface, a synthetic resin surface, or a wooden surface) is coated with the synthetic resin. Similarly, it will be selectively generated according to the drag force.

<Second effect by supporting the ladder by the frictional force with the rope>

Here, to explain how to route the wire or rope, in the present embodiment, as is schematically shown in the plan view in FIG. 28 (a), in the tilted posture of the ladder 40, at each end of each wire 50. An end loop 302 (see FIG. 13 (a)) is supported using (intervening) connectors 210 and 220 as mounting brackets (fixed invariantly) fastened to the corresponding column 22. The intermediate portion of each wire 50 is in contact with and engages with the back surface of the ladder 40 at any position, while being moored to the strut 22 (the rope end is located at the corresponding strut 22).

In the light load state (the state in which the slip is possible), the contact position between each wire 50 and the ladder 40 and the contact position between each wire 50 and the vertical sign 20 are both vertical and horizontal. It can also be arbitrarily displaced three-dimensionally in the diagonal direction. On the other hand, since each wire 50 is flexible in itself, it can take an arbitrary path.

Therefore, in the light load state (the state in which the slip is possible) and the light tension state in which a small tension is generated in all the wires 50, the contact position between each wire 50 and the ladder 40, and each The contact position between the wire 50 and the vertical sign 20 is autonomously and three-dimensionally displaced to a position where all the wires 50 and the vertical sign 20 ladder 40 are dynamically balanced.

Therefore, in the light tension state, the behavior that each wire 50 and the ladder 40 come into contact with each other so as to be relatively displaceable, that is, as a result of allowing slippage, each wire 50 and the ladder 40 standing signboard 20 initially come into contact with each other. It is expected that the unbalanced geometry will be automatically positioned (self-corrected) to a better balanced geometry.

Therefore, according to the present embodiment, the position where each wire 50 contacts the ladder 40 and the vertical signboard 20 is fixed and slip is not allowed (for example, as shown in Patent Document 6 above, the rope is bound to the ladder. In the heavy load state after the automatic positioning, slack continues to occur in each wire 50 unplanned, and a local overload is applied to any component of the system 10. It is suppressed that it continues to occur.

Then, according to the present embodiment, each wire 50 and the ladder 40 and the vertical signboard 20 slip relative to each other due to the frictional force generated by the synthetic resin coating the surface of each wire 50. It is more effectively prevented than without it.

As described above, in the light load state, only a negligibly small frictional force is generated between each wire 50 and the ladder 40, so that the operator sets the relative positions of each wire 50 and the ladder 40. It can be changed to any target position by slipping between.

Therefore, the worker installs the ladder 40 at a certain position while descending from the ladder 40, the work (for example, the above-mentioned change work) is completed at that position, and then the ladder 40 is placed at the adjacent position. When trying to move, as described above, since the frictional force between each wire 50 and the ladder 40 is small, the operator can slide the ladder 40 with respect to each wire 50 with a small force. The sideways movement of the ladder 40 for changing the work place in the lateral direction becomes easy.

<Effect of positioning the ladder in a tilted position without pressing the upper part of the ladder against the work target surface or its surroundings>

In order to position the ladder 40 relative to the work target surface (display surface 32), the upper part of the ladder 40 is locally placed on or around the work target surface while the lower end of the ladder 40 is in contact with the support surface. A technique is known in which the ladder 40 is supported at both ends in a tilted posture by pressing against the ladder 40.

However, when this technique is adopted, the worker can work on the part of the work target surface to which the upper part of the ladder 40 is pressed because the access to that part is obstructed by the ladder 40. I can't do it. Therefore, it is necessary for the operator to move the ladder 40 laterally to update the portion of the work target surface to which the upper portion of the ladder 40 is pressed.

On the other hand, according to the present embodiment, in order to position the ladder 40 relative to the work target surface, the upper portion of the ladder 40 is locally pressed against any part of the work target surface. .. Therefore, any part of the work target surface is not obstructed by the ladder 40. Therefore, the operator does not need to move the ladder 40 laterally in order to move the portion of the work target surface that is obstructed by the ladder 40.

<Expansion of work space>

In the present embodiment, for example, the display board 30 may adopt a double-sided display type. In this case, the display board 30 has a front side display surface 32 facing the center of the site and a back side display surface 32 facing the outside of the site.

The front side display surface 32 and the back side display surface 32 each act as information display surfaces independent of each other. Therefore, the operator needs to perform the information change work separately for each display surface 32, but the content of the information to be displayed may be common to each other for the display surface 32. In any case, the standing signboard 20 can display information on both the front side display surface 32 and the back side display surface 32, respectively, to both the person inside the site and the person outside the site.

In this aspect, prior to the change operation, the display board 30 is fixed in an inclined posture with respect to the vertical reference plane so that the lower end portion of the display board 30 approaches the center of the site from the upper end portion. Further, in accordance with this, the ladder 40 is fixed in an inclined posture so as to extend in a direction generally parallel to the back side display surface 32 from the lower side to the upper side of the display plate 30.

As a result, a geometric layout is established in which the central portion of the ladder 40 generally faces the back side display surface 32 with a work space of a size required for the change work. The work space formed at that time has a shape extending with generally the same width dimension in the side view.

In short, the standing signboard system 10 has a standing signboard 20 and a ladder 40 as shown in FIG. The standing signboard 20 has a support column 22 and a display board 30. The display board 30 is connected to the support column 22 so as to be tiltable about the horizontal axis with respect to the vertical reference plane of the vertical signboard 20. As shown in the figure, the display board 30 is fixed to the support column 22 in a posture in which the display board 30 is tilted at a target angle with respect to the vertical reference plane.

As shown in the figure, the ladder 40 extends in a direction generally parallel to the display board 30 in the tilted posture as the ladder 40 moves from the lower side to the upper side of the display board 30 with respect to the standing signboard 20. It is fixed in a leaning posture.

As a result, according to the standing sign system 10, as shown in the figure, even in a site where it is difficult for an operator to install the ladder 40 as a scaffold at an appropriate position and angle. Between the display board 30 and the ladder 40, which are tilted in the same direction and at substantially the same angle, a space necessary for the operator to change the information on the standing signboard 20 is secured.

In the present embodiment, the display board 30 can swing around the horizontal axis along the upper end of the display board 30, but in the present invention, the display board 30 has the horizontal axis along the middle or lower end of the display board 30. It may be carried out in a mode in which it can swing around.

However, in the embodiment in which the display board 30 can swing around the horizontal axis along the upper end portion thereof, the display board 30 can swing around the horizontal axis along the middle portion or the lower end portion thereof. Further, there is an advantage that it is easy to secure a work space in the lower part of the standing signboard 20 where the geometrical restrictions are stricter than the upper part due to the existence of the site boundary line and the fence.

<Expansion of bottlenecks in the movement route>

The narrowest part of the entire work space formed between the display board 30 and the ladder 40 that is occupied by the movement path of the worker on the ladder 40 is the movement path of the worker on the ladder 40. Is the bottleneck of. If the bottleneck in the movement path is narrow, even if the worker tries to start climbing the ladder 40, the display board 30 gets in the way and cannot start climbing the ladder 40.

In the present embodiment, if the required size of the bottleneck in the movement path is secured only by tilting the ladder 40 while keeping the display board 30 in the upright posture, the standing signboard 20 does not have to be tilted. ..

However, if the required size of the bottleneck in the movement path is not secured even if the ladder 40 is tilted while the display board 30 is kept in the upright posture, the bottleneck in the movement path is also tilted by tilting the display board 30. It is necessary to expand.

At this time, if the display plate 30 is tilted so that the lowermost end position of the display plate 30 is separated from the ladder 40, for example, about 10 cm forward, the bottleneck in the movement path expands, and as a result, the operator can move the ladder 40. Can be climbed without obstacles.

<Effects of unique usage of ladders>

Assuming a situation where a worker climbs a ladder and performs manual work on the ladder, for example, as disclosed in Patent Document 6 above, normally, the ladder is leaned against an object to be worked on, whereby the ladder is leaned against the work object. , The upper end of the ladder is supported by the work object and is tilted toward the work object. In this state, the worker climbs the outer surface of the ladder in a posture of facing the outer surface (diagonally upward surface) opposite to the inner surface facing the work object, and is in the middle of the outer surface. Stop at and do the necessary manual work.

On the other hand, in the present embodiment, for example, as shown in FIG. 3, the ladder 40 is not leaned against the standing signboard 20 as a work object, and therefore the upper end of the ladder 40 is not supported by the work object. At the same time, it is tilted away from the work object. In this state, the worker climbs the inner surface of the ladder 40 with his / her back facing the inner surface (diagonally upward surface) facing the work object, stops in the middle of the inner surface, and is required. Do manual work.

Therefore, according to the usage in the present embodiment, unlike the normal usage, the worker uses the ladder 40 as if leaning against it as a chair, so that the entire back surface of the worker is deposited on the ladder 40. Is supported. As a result, according to this usage, the operator can easily separate both hands from the ladder 40 on the ladder 40, and thus can easily perform the necessary manual work with peace of mind.

On the other hand, in the normal usage, when the entire front surface of the worker is to be left in the chair, the worker becomes stuck and unstable. Therefore, it is difficult to separate both hands from the ladder, and it is difficult to carry out the necessary manual work with peace of mind.

In the first place, the ladder is not supposed to be mainly used by an operator to stop in the middle of the ladder to perform manual work, and therefore, in normal usage, the necessary manual work cannot be performed with confidence. On the other hand, according to the present embodiment, the worker can safely perform the necessary manual work in the middle of the ladder 40.

[Second Embodiment]

Next, a signboard system 400 according to an exemplary second embodiment of the present invention will be specifically described with reference to FIGS. 14-17. However, with respect to the elements common to the first embodiment, by quoting them with the same reference numerals or names, duplicate explanations will be omitted, and only different elements will be described in detail.

As shown in FIG. 14, the standing sign system 400 has the standing sign 20, the ladder 40, the three fasteners 70, 70, 70, and the first one, similarly to the standing sign system 10 according to the first embodiment. It has a connecting tool 210, two second connecting tools 220 and 220, and a plurality of wires 50 as a flexible connecting tool.

In the standing signboard system 400, unlike the standing signboard system 10, the display board 30 is used in an upright posture as shown in the figure during the changing work by the operator.

The same wire 50 used in the standing sign system 400 can also be used in the standing sign system 10. As will be described in detail later with reference to FIG. 17, each wire 50 has a function of adjusting the effective length.

As shown in FIG. 14, in this standing sign system 400, the standing sign 20 is in an upright posture and the ladder 40 is horizontal to the standing sign 20 at an intermediate position in the height direction at the time of the change work. A layout that is connected in a deployed posture is realized. In this standing sign system 400, the columns 22 and 22 are fixed to the standing sign 20 in a horizontally unfolded posture so that the ladder 40 can be partially supported by the side surface of the standing sign 20 during the change work. It is hung from the wire 50 via a plurality of wires 50.

In this change work layout, the ladder 40 is fixed to the horizontal deployment posture at each end via two wires 50 extending from the pair of columns 22 and 22 of the vertical sign 20.

Specifically, in the example shown in the figure, that is, in the first wire routing example, first, each wire 50, which originally forms a straight line, is bent so as to form one loop. In that state, both ends of each wire 50 before bending (that is, the upper end of the loop after bending) are connected to a second connector 220 (or a first connector 210), although not shown. On the other hand, the middle portion of each wire 50 before bending (that is, the lower end portion of the loop after bending) is formed on the pair of vertical bars 42, 42 of the ladder 40, respectively, from the wires 50, 50 to the ladder. The 40s are connected so as to be suspended.

As shown in FIG. 15A, when this standing signboard system 400 is used, since the standing signboard 20 is installed near the boundary line in the site, the ladder 40 is used as a scaffolding for the workers on the same site. In the first work environment where it cannot be installed at an appropriate position inside, the ladder 40 is arranged in a horizontally deployed posture so as to cross the boundary line (enter the space above the adjacent land), and work on the ladder 40. It is possible for a person to perform change work in a standing posture.

Note that FIG. 6A shows an example of second wire routing for the plurality of wires 50.

Further, as shown in FIG. 3B, when this standing signboard system 400 is used, since it is installed near the fence installed near the boundary line on the site, it is not possible to use a normal standing signboard. In the second work environment where the work space for the change work cannot be secured in an appropriate size, the ladder 40 is arranged horizontally so as to cross the fence, and the worker changes in a standing posture on the ladder 40. It is possible to do the work.

As shown in FIG. 3B, when the worker performs the changing work in a standing posture on the ladder 40, the ladder 40 is weighted by the worker as shown in FIGS. It bends downward. Therefore, the height of the ladder 40 when the ladder 40 is horizontally installed in the air is set in advance so that the ladder 40 does not come into contact with the upper end of the fence and push and bend even at the maximum bending position of the ladder 40.

As illustrated in 16: In the second working environment shown in FIG. 15B, when the vertical sign system 400 is used, the ladder 40 is horizontally arranged so as to cross the fence. At each end of the ladder 40, the ladder 40 is fixed in a horizontally unfolded posture via two wires 50 extending from each support column 22 of the vertical signboard 20.

FIG. 16 shows a third wire routing example for the plurality of wires 50. Specifically, one end of each wire 50, which is linear as a whole, is connected to, for example, a second connector 220 mounted at point P2, while the lower end is a pair of vertical bars 42 of a ladder 40. , 42, which are connected to the corresponding ones (right end or left end) at both ends of the corresponding ones (front vertical bar 42 or rear vertical bar 42).

<Wire structure>

In FIG. 17A, any one of the plurality of wires 50 is typically shown in the front view. Each wire 50 extends linearly in the unfolded state. Each wire 50 is configured as a series connection of at least four segments. These segments are a segment A constituting one end of each wire 50, a segment D forming the other end, and segments B and C located in the middle thereof.

As shown in FIG. 13B, segment A is folded back so that both ends of the wire rope 410 form a loop 412, and each terminal is clipped 414 to the wire rope 410, as in FIG. 13A. It is configured by being fixed to the main body of the. The segment D has a structure common to that of the segment A.

As shown in FIG. 6A, the wire rope 410 is used in a straight line posture without folding back to form the segment A, whereas the wire rope 410 loops to form the segment D. It is folded back and used to form 422. Both ends (loops 421, 412) that are folded back and arranged adjacent to each other to form the segment D are connected by a shackle (for example, a rigid metal fitting having a through hole) 420 that forms a common segment C at both ends. This constitutes one loop 422.

As shown in FIG. (B), the segment B has a turnbuckle (for example, a length-adjustable connector, a length-adjustable connector, and a rope-tension-adjustable connector). (Ingredients, etc.) 430. The turnbuckle 430 has a body portion 432 having a pair of coaxial female threaded portions and a pair of coaxial bolts 434 and 434 screwed onto the female threaded portions. The free ends of each of the bolts 434 and 434 have a connecting portion (eg, eye end) 436 to allow connection with other members.

In this embodiment, a turnbuckle 430 is interposed between the segments A and C so that the segments A and C are connected to each other and the total length of the corresponding wire 50 is the turnbuckle. It can be adjusted according to the amount of rotation by the operator with respect to 430.

[Third Embodiment]

Next, a vertical sign system 500 according to an exemplary third embodiment of the present invention will be specifically described with reference to FIGS. 19-26 and 28. However, with respect to the elements common to the first embodiment, by quoting them with the same reference numerals or names, duplicate explanations will be omitted, and only different elements will be described in detail.

<Usage mode>

FIG. 19A is a side view showing the standing signboard system 500 together with the standing signboard 20 and the ladder 40 in a state in which the standing signboard 20 is in an upright posture and the ladder 40 is in a tilted posture. Similar to the first embodiment, the standing signboard 20 has a pair of columns 22, 22 and a display board 30.

FIG. 3B is a side view showing how a rectangular work space is formed between the two when the standing signboard 20 is in the tilted posture and the ladder 40 is in the tilted posture in the side view. Is. This standing signboard system 500 can be implemented in a state where the standing signboard 20 is in a tilted posture. In the figure, “θ” indicates the tilt angle of the ladder 40 from the vertical reference plane, while “ψ” is the distance angle of the display board 30 of the signboard 20 from the vertical reference plane. Shows a certain tilt angle.

FIG. 3C shows a side view showing how a fan-shaped work space is formed between the two when the standing signboard 20 is in the upright posture and only the ladder 40 is in the tilted posture. It is a figure. It is also possible to carry out the standing signboard system 500 in a state where the standing signboard 20 is in an upright posture.

<Basic configuration>

To schematically explain the basic configuration, as shown in FIG. 19, the standing sign system 500 includes a standing sign 20 and a ladder 40, as in the first embodiment.

The vertical sign system 500 is further configured to include a ladder support unit 510 that is partially different from the first embodiment, as shown in FIG. 19A. The ladder support unit 510 constitutes an example of the "ladder support unit" according to an exemplary embodiment of the present invention.

As shown in the figure, the ladder support unit 510 includes three lateral ropes 520, 520, 520 corresponding to the three wires 50, 50, 50 in the first embodiment, and as shown in the figure. , The first and second connecting tools (an example of mounting bracket) 210 and 220 in the first embodiment are configured to include two vertical ropes 530 and 530.

Here, the three lateral ropes 520, 520, 520 individually constitute an example of the "first rope" and also constitute a set of rope assemblies or rope sets. In addition, the two vertical ropes 530 and 530 individually function as temporary fixing attachments and form a set of rope assembly or rope set. Further, the two vertical ropes 530 and 530 are examples of the support tool in the vertical signboard system according to the item (5), respectively.

Here, at least the horizontal ropes 520, 520, 520 of the horizontal ropes 520, 520, 520 and the vertical ropes 530, 530 constitute an example of the "ladder upper stabilizing portion".

Further, as shown in the figure, the ladder support unit 510 has a fixture 550 detachably attached to each support column 22 for each support column 22, unlike the first embodiment. Each fixture 550 is held by suspending a corresponding longitudinal rope 530.

As shown in FIG. 26, the ladder support unit 510 further constrains the horizontal movement of the lower portion of the ladder 40 (the portion including the lower end of the ladder 40 and having a length) within a predetermined range in the installed state. The book's horizontal ropes 540, 540 (an example of the "second rope"; rope assembly) are configured to include those supported by a pair of struts 22, 22 so as to extend horizontally. .. This configuration will be described in detail later, but the same configuration is adopted in the first embodiment.

Here, at least the horizontal ropes 540, 540 and the pair of columns 22 and 22 of the horizontal ropes 540, 540 and the pair of columns 22, 22 constitute an example of the "ladder lower stabilizing portion".

<Rope handling>

Here, the rope routing adopted in the ladder support unit 510 will be schematically described in comparison with the first embodiment. As described above, in the first embodiment, the plan view is shown in FIG. 28 (a). As schematically shown in, in the tilted position of the ladder 40, each end of each wire 50 (an example of an open wire or rope) is fastened to the corresponding strut 22 with a connector 210 and a connector 210 as a mounting bracket. The 220 is used (intervened) to be moored to the corresponding stanchion 22 (the rope end is located on the corresponding stanchion 22), while the middle portion of each wire 50 is at any position on the ladder 40. Contact and engage the back surface.

That is, the figure shows an example of a mooring type rope routing using metal fittings.

When adopting this rope handling example, a rope composed of three wires 50 is considered in consideration of the possibility that any of the display surfaces 32 on both sides of the display board 30 of the vertical signboard 20 may be a work target. A total of two sets are prepared, a rope set for work on the display surface 32 on the front side and a rope set for work on the display surface 32 on the back side, and can be used for work on the display surface 32 on either side. To make it possible, the two sets may be attached to the standing sign 20 together.

On the other hand, in the present embodiment, as shown schematically in the plan view in FIG. 28 (b), in the tilted posture of the ladder 40, each lateral rope 520 (closed rope or wire) is viewed in plan view. In, a mounting bracket fastened to the corresponding support column 22 is used so as to surround the standing signboard 20 and the ladder 40 in a path that passes laterally behind the standing signboard 20 and laterally passing behind the ladder 40. It is handled without doing it. Each lateral rope 510 contacts and engages the back surface of the ladder 40 at any position.

That is, the figure shows an example of a surrounding type rope routing that does not use metal fittings.

In the case of adopting this rope handling example, if even one rope set consisting of three ropes 520 is attached to the vertical signboard 20, the same rope set can be attached to the display surfaces 32 on both sides of the display board 30 of the vertical signboard 20. It can be used during any of these tasks.

Further, when this rope handling example is adopted, unlike the one shown in FIG. 6A, one rope set consisting of three ropes 520 is attached to a pair of columns 22 and 22 without mounting brackets. It is possible to wear it.

On the other hand, it is desirable that the mounting bracket fits the corresponding column 2. Further, if the shape and size of the support column 22 are different, it is necessary to make the shape and size of the mounting bracket different accordingly.

On the other hand, if the rope handling example shown in FIG. 6A is adopted, it is not necessary to use the mounting brackets that depend on the specifications of the columns 22, so that the types of columns 22 that can be supported by the same rope set can be used. Is increased, and the versatility for the variety of the columns 22 is improved.

Here, the rope handling adopted in the ladder support unit 510 will be described more specifically.

FIG. 20 is a perspective view showing how three lateral ropes 520 and 520 having different height positions are routed so as to pass outside each of the columns 22 in the ladder support unit 510. There is. The lateral ropes 520, 520, and 520 pay attention to their individual height positions, and are also referred to as an upper rope 520, a middle rope 520, and a lower rope 520, respectively. In the present embodiment, all the ropes 520 are coated with synthetic resin, but only a part of the ropes 520 may be coated, or the present invention may be carried out without any coating.

Further, the figure also shows in a perspective view how one vertical rope 530 is detachably attached to each support column 22. Similarly, another vertical rope 530 is detachably attached to the support column 22 on the opposite side (not shown).

Further, the figure also shows in a perspective view how the horizontal rope 520 and the vertical rope 530 are connected to each other at each support column 22. Specifically, the horizontal rope 520 and the vertical rope 530 have one corresponding horizontal rope 520 penetrating each ring 532, 534, 536 of the vertical rope 530. These rings 532, 534, 536 pay attention to individual height positions, and are also referred to as an upper ring 532, a middle ring 534, and a lower ring 536, respectively. In the present embodiment, both ropes 520 are coated with synthetic resin, but the present invention may be carried out without coating.

<Structure of lateral rope>

In FIG. 21, any one of the three lateral ropes 520, 520, and 520 is typically shown in a plan view in a used state (connected state). The lateral ropes 520, 520, and 520 are common to each other in terms of configuration, but are different from each other in terms of overall length (maximum length) as in the first embodiment.

Each lateral rope 520 has a component configuration similar to the wire 50 shown in FIG. Specifically, each lateral rope 520 is a turnbuckle having one wire rope segment 410 as the main rope, a shackle or ring catch as the connecting bracket 420, and a pair of eye ends 436,436 at both ends. It has 430 (an example of the length adjusting mechanism).

FIG. 19 (a) shows that each lateral rope 520 has a turnbuckle 430, thereby having a variable length range.

Both ends of the wire rope segment 410 are bent, and the ends of the wire rope segment 410 are crimped to the main body with clips 414 to bind the wire rope segments 410, whereby end loops 421 and 412 are formed at both ends, respectively. One end loop 412 is detachably connected to the connecting fitting 420, while the other end loop 412 is detachably or detachably connected to one eye end 426 of the turnbuckle 430.

The connecting metal fitting 420 can be released manually. Therefore, the connecting metal fitting 420 has a hook 421 for partially opening the continuous ring of the connecting metal fitting 420, such as a snap hook, an elastic hook, and a slide hook.

Before use, each lateral rope 520 is in an unfolded state (unconnected state, open state, open end state), and in this state, the lateral rope 520 in the connected state shown in FIG. 21 is connected to the connecting metal fittings. This is achieved by releasing the 420 and separating the connecting fitting 420 from the wire rope segment 410.

Each lateral rope 520 is usually transported from the storage location to the standing signboard 20 as a site in its unfolded state. Then, upon arriving at the site, each lateral rope 520 first passes through the corresponding one of the three rings 532, 534, 536 by the operator in this unfolded state, as shown in FIG. As such, it is handled.

When the handling work is completed, the operator connects the connecting fitting 420 and the wire rope segment 410 to each other, and as a result, one closed lateral rope 520 is completed as shown in FIG.

After that, the ladder 40 is installed close to the standing signboard 20 by the worker, and in that state, each lateral rope 520 is arranged so as to surround the ladder 40 on the standing signboard 20 in a plan view. Rope. At this time, each lateral rope 520 passes behind the ladder 40, the outside of the pair of columns 22 and 22, and behind the back surface of the vertical signboard 40 (in this case, the back side display surface 32 as the work target surface). Extend in a closed path.

In this state, all three lateral ropes 520, 520, and 520 are paired without excessive slack (more than the allowable value) so that the operator can realize the target value of the inclination angle θ of the ladder 40. The effective lengths of the lateral ropes 520, 520, 520 are individually adjusted by the rotation operation of the corresponding turnbuckle 430 so as to extend from the columns 22 and 22 of the.

As a result, with the target value of the inclination angle θ of the ladder 40 being realized, all the lateral ropes 520, 520, and 520 are wound around the vertical signboard 20 and the ladder 40 in a tense state (without excessive slack). As a result, the operator is ready to climb the ladder 40 and perform the necessary work on the display board 30.

<Structure of vertical rope>

As shown in FIG. 20, each vertical rope 530 (an example of the "third rope") is in the vertical direction of each horizontal rope 520 (an example of the "first rope") at the corresponding column 22. It serves as a support to support each lateral rope 520 so that its position is defined.

This support does not uniquely define the vertical position of each lateral rope 520 as in the first and second couplers 210 and 220 in the first embodiment, but within a predetermined variable range. Define loose rather than tight or flexible rather than rigid so that it can be freely displaced.

That is, as will be described in detail later, each vertical rope 530 loosely attaches each horizontal rope 520 with respect to a vertical position in which each horizontal rope 520 contacts each strut 22 and passes there horizontally. Or it has a temporary fixing function that guides roughly.

Each vertical rope 530 has a number of rings (for example, in this embodiment, the same number) as the number of horizontal ropes 520 or more (for example, a loop as a part of the rope, a component independent of the rope) for each support column 22. (Ring-shaped metal fittings, etc.) 532, 534, 536 are provided at positions in different length directions. Since each longitudinal rope 530 is used to hang along the corresponding stanchion 22, the rings 532, 534, 536 will eventually have different vertical positions from each other.

The upper rope 520 penetrates the upper ring 532, the middle rope 520 penetrates the middle ring 534, and the lower rope 520 penetrates the lower ring 536. Since each ring 532, 534, 536 has a through hole larger than the outer cross-sectional area of the rope, each rope 520 can be loosely translated into the corresponding ring 532, 534, 536 (translation in the rope thickness direction). Will fit.

As a result, the longitudinal rope 530 and each ring 532, 534, 536 do not uniquely constrain the vertical position of the corresponding rope 520, but rather multiple lateral ropes 520, 520, 520 with respect to the vertical direction. It only has the function of temporarily fixing.

Specifically, when each lateral rope 520 is not in a tense state because it does not support the ladder 40, the vertical rope is prevented from falling more than necessary due to its own weight. There are 530 and each ring 532, 534, 536.

The final vertical position of each lateral rope 520 is comprehensively determined by multiple factors such as the length of the plurality of lateral ropes 520, 520, 520, its own weight (cause of sagging), and flexibility. Moreover, when tension is applied to each lateral rope 520, it is determined almost autonomously, and as a result, it is expected that the rope path is determined almost autonomously.

As described above, each vertical rope 530 has a function of tentatively, that is, tentatively defining the vertical position where each horizontal rope 520 passes through each support column 22. That is, each vertical rope 530 has a function of temporarily fixing each horizontal rope 520 with respect to a vertical position in which it passes through each support column 22.

FIG. 19 (a) shows that each longitudinal rope 530 has loose rings 532,534,536, thereby having a height variable range.

An example of each vertical rope 530 will be specifically described with reference to FIG. 20, and each vertical rope 530 includes one wire rope segment 537 and a connecting unit for forming the middle ring 534. Is configured to have.

The upper end of the wire rope segment 537 is bent and the ends are clipped and tied together to form a loop, which functions as the upper ring 532.

Similarly, the lower end of the wire rope segment 537 is bent and its ends are clipped and tied together to form a loop, which functions as the lower ring 536.

In the present embodiment, all the ropes 530 are coated with synthetic resin, but only a part of the ropes 530 may be coated, or the present invention may be carried out without any coating.

<Middle ring>

The connecting unit is mounted at the center of the wire rope segment 537. As shown in FIG. 22, the connecting unit includes a U-shaped bolt set as a connecting tool 538 (having a configuration similar to the U-shaped bolt 102 shown in FIG. 7) and a U-shaped ring as a ring-shaped metal fitting 539. Configured to have.

The ring-shaped metal fitting 539 is a U-shaped metal fitting 539c in which a pair of arm portions 539a and 539b are connected to each other at one ends thereof, and a pin 539d capable of closing the open end portions of the pair of arm portions 539a and 539b. It has one that can be attached to and detached from the arm portions 539a and 539b by manual operation.

As shown in FIG. 22, the connector 538 is centered on the wire rope segment 537 by co-fastening the central portion of the wire rope segment 537 and a portion of the arm portion 539a of the ring-shaped metal fittings 539. A ring-shaped metal fitting 539 is connected to the portion in an invariant state. The through hole in the ring-shaped metal fitting 539 (that is, the cavity between the pair of arm portions 539a and 539b) is larger than the outer cross-sectional area of the middle rope 520.

Therefore, the middle rope 520 loosely passes through the through hole of the ring-shaped metal fitting 539, that is, the inside of what functions as the middle ring 534, in a state where the vertical position of the middle rope 520 is variable with respect to the middle ring 534. It will be.

In this embodiment, the middle ring 534 is realized by using the mounting brackets 538 and 539. Therefore, according to the present embodiment, the work of changing the lengthwise position of the middle ring 534 in the corresponding vertical rope 530 loosens the connector 538 and slides it on the vertical rope 530 thereafter. As a series of operations for tightening the connecting tool 538, it can be easily performed at the site. However, the middle ring 534 may be realized by using a loop with a wire rope instead.

<Fixing tool>

In FIG. 23, the fixture 550 shown in FIGS. 19 and 20 is shown in an enlarged perspective view. The fixing portion 550 is detachably attached to the outer surfaces 80 and 80 of the pair of columns 22 and 22, respectively. Each fixture 550 has a magnet (permanent magnet) 552, and is detachably attached to the outer surface 80 of the corresponding column 22 by the magnetic force of the magnet 552.

An example of the magnet 552 is a neodymium magnet. In this example, the fixed portion 550 has a yoke in addition to the neodymium magnet, for example, and the yoke causes the magnetic force generated from the neodymium magnet to be concentrated on the attraction surface on one side of the neodymium magnet.

With each fixture 550 being magnetically attracted to the surface of the corresponding strut 22, the corresponding longitudinal rope 530 is at its upper end position (eg, upper ring 532) and the hook 554 of each fixture 550. Suspended from. The hook 554 hangs down from a convex portion 558 formed on the surface of the main body portion 556 of the fixture 550 that accommodates the magnet 552.

By the way, in the present embodiment, as shown in FIG. 19, three lateral ropes 520 are supported by a ladder 40 and a pair of columns 22, 22 so as to extend substantially horizontally between them. ..

Therefore, in a state where a mechanical balance is established in a dynamical system consisting of a pair of columns 22, 22, a ladder 40, and three lateral ropes 520, a load acting directly downward on the ladder 40 (with its own weight of the ladder 40). When a moment is generated on the ladder 40 due to the sum with the weight of the worker, etc.), a counter moment in the direction of canceling the moment is generated by the three lateral ropes 520 and the pair of columns 22, 22. In order to generate the counter moment, an axial force, that is, tension is generated in each rope 520.

At this time, since each lateral rope 520 extends laterally (generally in the horizontal direction) over the entire variable region of the inclination angle θ, it engages with the outer surface 80 of each column 22 substantially vertically. Specifically, in the prototype of the present inventor, the tilt angle θ does not exceed about 20 degrees, and the total length of the ladder 40 is about 2500 mm. Therefore, the ladder 40 has a maximum tilt angle θ (for example, 20 degrees). ), The amount of the contact point between each rope 520 and the ladder 40 descending from the time when the inclination angle θ = 0 is sufficiently small.

As mentioned above, each rope 520 is inevitably bent downward due to its own weight.

FIG. 29A is a perspective view. In the prototype of the ladder support unit 510 shown in FIG. 19, the ladder 40 faces horizontally forward (approaches the display plate 30) from behind the plurality of lateral ropes 520. In the orientation), each lateral rope 520 is supported without excessive deflection (practically unacceptably large deflection) (a tension state where the deflection is 0 is a complete tension state, whereas an excessive tension state). In a tense state without deflection, for convenience, a semi-tension state), each lateral rope 520 bends due to its own weight.

FIG. 6A further shows how each lateral rope 520 makes point contact with the ladder 40 and the pair of columns 22 and 22 at a plurality of contact points. Specifically, each lateral rope 520 is in point contact with the back surface of the ladder 40 (the back surface of each of the pair of vertical bars 42, 42) at two points of contact, and the pair of columns 22, With the 22, point contact is made with two contact points for each support column 22. Further, the figure (b) is a plan view with respect to the figure (a).

In any case, the dominant component of the force acting on each strut 22 from each lateral rope 520 is the normal component. At the same time, even if a tangential component is present, it is small, and since there is a tangential frictional force between each lateral rope 520 and the support column 22, the small tangential component is canceled by the frictional force.

Further, since each lateral rope 520 is loosely connected by each ring 532, 534, 536, even if vertical movement occurs in each rope 520 due to autonomous positioning, as long as it does not exceed a certain range. , Each rope 520 does not squeeze each ring 532, 534, 536.

Therefore, each lateral rope 520 engages with each strut 22 substantially perpendicularly in any practical case, and at that engaging position, each lateral rope 520 is loosely guided by the longitudinal rope 530. Since the ropes 520 do not move relative to the vertical ropes 530 mounted on the columns 22 in the vertical direction, the horizontal ropes 520 do not apply axial force or tension to the vertical ropes 530. That is, the vertical rope 530 is not pulled due to the external force from each horizontal rope 520.

In this way, since the vertical rope 530 temporarily fixes the three horizontal ropes 520, it does not receive a load from any of the horizontal ropes 520. Therefore, each rope 520 does not push down the longitudinal rope 530. The present inventor confirmed this fact in the prototype.

Therefore, it is basically sufficient for the fixture 550 to have a load-bearing characteristic that exceeds the weight of one vertical rope 530. Therefore, it is not indispensable to select neodymium from a plurality of types of materials as the main component of the magnet 552 from the viewpoint of maximizing the magnetic force, and the magnet 552 may be, for example, a ferrite magnet.

Further, according to the present embodiment, the worker can determine the position in which the fixture 550 is detachably mounted among the plurality of height-direction positions of each support column 22 in the field, such as the worker's experience and preference. It is possible to decide freely according to the experience of skilled workers.

Further, after the operator attaches the fixture 550 to the support column 22 and starts another ladder support work, if it is found that the current attachment position of the fixture 550 is defective on the way, another work is performed. In the middle of, for example, the vertical rope 530 is hung from the fixture 550, and each horizontal rope 520 passes through each ring 532, 534, 536 of the vertical rope 530 and is loosely guided. In this state, the fixture 550 can be reattached and the attachment position can be raised or lowered from the initial position (temporary attachment position). This is because the longitudinal rope 530 is in a substantially no-load state.

That is, the operator can appropriately adjust the height direction position of each lateral rope 520 during the execution of the ladder support work.

Further, according to the present embodiment, in order to enable the fixture 550 to be attached to each support column 22, it is not necessary to perform additional processing on each support column 22 in advance to enable the attachment.

<Principle that the ladder achieves the target tilt angle>

As shown in FIG. 19, the worker assumes a work space of a size necessary for himself / herself prior to installing the ladder 40 in a tilted posture, and then the ladder necessary for realizing the target work space. The tilt angle θ of 40 is determined.

FIG. 24A is a side view for explaining the height adjusting mechanism of the vertical rope 530 and the principle that the inclination angle θ of the ladder 40 changes due to the height adjusting mechanism of the vertical rope 530 in the ladder support unit 510.

The height adjusting mechanism of the longitudinal rope 530 depends on the height position variability of the fixture 550 and the loose fitting of each ring 532, 534, 536. Even if the height position of the fixture 550 is not changed, each lateral rope 520 has a height variable range and its height, thanks to the height position variability due to the loose fitting of each ring 532, 534, 536. Within the variable range, the operator can change the actual height position of each lateral rope 520.

For each lateral rope 520, the tilt angle θ of the ladder 40 changes as its actual height position changes, even if its effective length is not changed. Specifically, the lower the height position of each lateral rope 520, the more the inclination angle θ increases, thereby expanding the work space.

For example, the actual height of the upper rope 520 is variable between the heights H1 and H2. At a height H1, the ladder 40 has a tilt angle θ1, and at a height H2 lower than the height H1, the ladder 40 has a tilt angle θ2 larger than the tilt angle θ1.

FIG. 3B is a side view for explaining the length adjusting mechanism of each lateral rope 520 and the principle that the inclination angle θ of the ladder 40 changes due to the length adjusting mechanism of each lateral rope 520 in the same ladder support unit 510.

The length adjusting mechanism of each lateral rope 520 is exemplified as a turnbuckle 430. Thanks to the length adjustment mechanism of each lateral rope 520, each lateral rope 520 has a variable length range, within which the operator can see the actual length of each lateral rope 520 ( Effective length) can be changed.

For each lateral rope 520, the tilt angle θ of the ladder 40 changes as its effective length changes, even if its actual height position does not change. Specifically, the longer each lateral rope 520, the greater the tilt angle θ, which expands the work space.

For example, the actual length of the upper rope 520 is variable between the lengths L1 and L2. When the length L1, the ladder 40 has a tilt angle θ4, and when the length L2 is shorter than the length L1, the ladder 40 has a tilt angle θ3 smaller than the tilt angle θ4.

FIG. 25A is a side view showing a good example in which three lateral ropes 520, 520, 520 are used in the ladder support unit 510, and FIG. 25B is a side view showing the same ladder support unit 510. FIG. 5 is a side view showing a bad example in which three lateral ropes 520, 520, 520 are used.

In a good use case, none of the lateral ropes 520 slacks, whereas in a bad use case, at least one lateral rope 520 also slackens.

The lateral rope 520 with slack cannot bear the load from the ladder 40 and the operator climbing it at all, so only the lateral rope 520 without slack bears the load, which is partly The lateral rope 520 tends to be overloaded.

<Stabilizing part at the bottom of the ladder>

FIG. 26A shows an unplanned horizontal movement of the lower part of the ladder 40 by two horizontal ropes 540, 540 (an example of the “second rope”) parallel to each other in the ladder support unit 510 shown in FIG. Is a perspective view for explaining the principle of limitation, and FIG. 3B is a side view.

In order to attach the horizontal ropes 540, 540 to the pair of columns 22, 22, the operator first attaches a pair of second connectors 220, 220 (see FIG. 9C) as a pair of mounting brackets, respectively. , Screwed to a pair of columns 22, 22. At this time, in the second connecting tools 220 and 220, unlike the example shown in FIG. 9C, the linear base end portion 234 of the U-shaped bolt 230 faces the inner surface 82 of each support column 22. As described above, it is attached to the pair of columns 22, 22.

Each horizontal rope 540 is a rope set configured by connecting a wire rope segment 542 and a turnbuckle 544 in series.

In this rope set, the ends of the wire rope segment 542 on the side not connected to the turnbuckle 544 have a loop 546, which loop 546 is the proximal end of the corresponding second connector 220. It is wound around the portion 234 and connected.

In this rope set, the end of the wire rope segment 542 on the side connected to the turnbuckle 544 has a loop 548, which loop 548 of the eye ends 550, 550 on both sides of the turnbuckle 544. Of these, the one on the side that is not connected to the corresponding second connector 220 is connected.

In this rope set, of the eye ends 550, 550 on both sides of the turnbuckle 544, the side not connected to the corresponding wire rope segment 542 is attached to the base end 234 of the corresponding second connector 220. They are connected in a mated state.

In one example, the width dimension of the spacing between the pair of horizontal ropes 540, 540 is set to be the same as, slightly wider than, or slightly narrower than the thickness of the vertical bar 42 of the ladder 40. In this example, the ladder 40 is sandwiched by a pair of horizontal ropes 540, 540 from both sides with almost no gap and is positioned substantially in a fixed manner. In one example, the vertical bars 42 of the ladder 40 are sandwiched by a pair of horizontal ropes 540, 540 from both sides in a compressed state by utilizing the elasticity of each rope 540 itself.

In the present embodiment, all the ropes 540 are coated with synthetic resin, but only a part of the ropes 540 may be coated, or the present invention may be carried out without any coating.

<Example of work procedure for installing the ladder in a tilted position>

First step: Horizontal rope mounting work

As shown in FIG. 26, the operator uses a pair of second connecting tools 220, 220 or similar mounting brackets at both ends of each of the two horizontal ropes 540, 540 to form a pair of columns 22. , 22 respectively. The operator fine-tunes the effective length of each horizontal rope 540 by rotating the turnbuckle 544 so that each horizontal rope 540 has as little slack as possible in the mounted state.

Second step: Vertical rope mounting work

As shown in FIG. 20, the operator attaches the fixture 550 to the outer surface 80 of each column 22 at an appropriate height position. After that, the operator suspends the vertical rope 530 from the fixture 550.

Third step: Lateral rope mounting work

First, as shown in FIG. 21, the operator opens the hook 421 of the shackle 420 and removes the loop 412 from the shackle 420, thereby opening the upper, middle and lower ropes 520, 520, 520. Put it in the closed state (unconnected state).

As shown in FIG. 20, the operator allows the upper rope 520 (which has a longer overall length than the other two ropes) to pass through the upper ring 532 and horizontally surround the entire standing sign 20. Handle. At this time, the loop 412 of the upper rope 520 is connected to the shackle 420, thereby bringing the upper rope 520 into a closed state (connected state).

Further, the operator pulls out the pin 539d from the ring-shaped metal fitting 539, passes the middle-stage rope 520 (having an intermediate overall length) through the middle-stage ring 534, and in that state, attaches the pin 539d to the ring-shaped metal fitting 539.

Further, the operator handles the middle rope 520 so as to pass through the middle ring 534 and horizontally surround the entire standing sign 20. At this time, the loop 412 of the middle rope 520 is connected to the shackle 420, whereby the middle rope 520 is brought into the closed state (connected state).

As shown in FIG. 20, the operator further causes the lower rope 520 (which has a shorter overall length than the other two ropes) to pass through the lower ring 536 and horizontally surround the entire standing sign 20. To handle. At this time, the loop 412 of the lower rope 520 is connected to the shackle 420, thereby bringing the lower rope 520 into a closed state (connected state).

Fourth step: Ladder installation work

As shown in FIG. 19, the operator positions the ladder 40 inside each lateral rope 520, and one of the pair of display surfaces 32, 32 of the vertical signboard 20 to perform the work 32. Place it so that it faces.

At this time, the ladder 40 is a segment of one display surface 32 and each lateral rope 520 excluding the segment passing along the opposite display surface 32, that is, the ladder 40 is horizontally behind the segment. It will be placed in a space surrounded by a ladder support segment that passes through and supports the ladder 40 horizontally forward from behind it.

Further, as shown in FIG. 26, the lower end of the ladder 40 is grounded to the support surface at an arbitrary position within the rectangular restricted area.

Further, as shown in FIG. 19, the operator leans the ladder 40 against the ladder support segment of each of the three lateral ropes 520, 520, 520, whereby the ladder 40 is tilted. Installed in a posture.

Fifth step: Lateral rope effective length fine adjustment work (sag removal, tension application)

Further, as shown in FIG. 19, the operator fine-tunes the effective length of each lateral rope 520 by rotating the turnbuckle 430 of each lateral rope 520, thereby slackening from each rope 520. Is removed to apply tension to each lateral rope 520.

Further, the operator adds necessary fine adjustments to each lateral rope 520 so that the target tilt angle θ, that is, the target work space, is realized on the ladder 40.

In addition, the order in which these five steps are executed can be changed as appropriate, for example, the order in which the first step is executed in parallel with or after the second step can be changed, or the first step. It is possible to change the order in which the steps are executed in parallel with or after the third step.

[Fourth Embodiment]

Next, the vertical sign system 600 according to the exemplary fourth embodiment of the present invention will be specifically described with reference to FIGS. 27 and 28. However, with respect to the elements common to the third embodiment, by quoting them with the same reference numerals or names, duplicate explanations will be omitted, and only different elements will be described in detail.

As described above, in the third embodiment, each lateral rope 510 (closed, endless, or endless) in the tilted position of the ladder 40, as schematically shown in the plan view in FIG. 28 (b). A pair of stanchions 22, so as to surround the standing signs 20 and the ladder 40 so that the ropes or wires of the above) pass behind the standing signs 20 and behind the ladders 40 in plan view. It is handled without using the mounting brackets 210 and 220 fastened to 22. Each lateral rope 510 contacts and engages the back surface of the ladder 40 at any position.

On the other hand, in the present embodiment, as shown schematically in the plan view in FIG. 3C, each lateral wire 620 (open, has an open end, or has an endd wire or rope is an example. ) Is moored to a pair of struts 22 and 22 using end loops 622 and 622 on both sides of each lateral rope 620 without the use of mounting brackets 210 and 220 fastened to the corresponding stanchions 22. On the other hand, the middle portion of each lateral rope 620 contacts and engages with the back surface of the ladder 40 at any position.

That is, the figure shows an example of a mooring type rope routing that does not use metal fittings.

In order to adopt this handling example, as shown in the figure, it is necessary that there is a gap through which the rope passes between the inner surface 82 of each column 22 and the side surface of the display plate 30.

FIG. 27 is a perspective view of the ladder support unit 610 according to the present embodiment so that three lateral ropes 620, 620, and 620 having different height positions are moored to the respective columns 22 and 22. It is shown how it is turned.

The path of each lateral rope 620 is an open path, which passes through the ladder 40 in a slippery state in contact with the back surface of the ladder 40 in the central portion of the path, and further passes through the ladder 40 in the left-right direction. At the end positions on both sides of the, moored to a pair of columns 22, 22, respectively.

As shown in FIG. 28 (c), each lateral rope 620 has a pair of end loops 622 at both ends thereof. Each lateral rope 620 is wound around and connected to a pair of columns 22 and 22, respectively, at each end loop 622.

In FIG. 27, a pair of vertical ropes 630 and 630 are attached to the pair of columns 22 and 22, respectively, and the horizontal ropes 620, 620 and 620 and the vertical ropes 630 and 630 are attached to the columns. It is shown in 22 that they are connected to each other. Each longitudinal rope 630 has a configuration common to each longitudinal rope 530 in the third embodiment.

As shown in the figure, each lateral rope 620 is temporarily fixed at each end loop 622 through each ring 532, 524, 526 of the corresponding longitudinal rope 630, respectively. It is wound around and connected to the columns 22 and 22 of the above. Thereby, the position where each end loop 622 of each lateral rope 620 and each support column 22 are connected to each other is defined to be variable within a certain range in the height direction, as in the third embodiment. ..

Each vertical rope 630 has a fixing ring (a loop made of the same material as the rope, or a ring-shaped metal fitting externally attached to the rope) 532,524,526, and the horizontal rope 620. It has the same number or more at different positions from each other in the length direction of each vertical rope 630.

Each longitudinal rope 630 is loosely coupled by a fixing ring 532,524,526 around some rope segment of the end loop 622 of each transverse rope 620. As a result, the range in which the position where each end loop 622 of each lateral rope 620 is moored to each support column 22 is variable in the vertical direction is limited.

Although FIG. 27 partially shows the component configuration of each lateral rope 620, the component configuration of each lateral rope 620 is common to that of the wire 50 shown in FIG.

Specifically, the end loop 622 is common with the loop 422. Each lateral rope 620 further has a shackle 420 (provided it has a movable hook 421 as in the third embodiment), a turnbuckle 430 with eye ends 436 and 436 on both sides, and loops 412 on both sides. It is configured to have a rope 626 composed of a wire segment 410 having.

However, each lateral rope 620 is not shown in either FIG. 17 or 27 and is shown in FIG. 28 (c), but is configured to have end loops 622 on both sides, respectively. Therefore, each lateral rope 620 is shown in FIG. 27 via another shackle 420 on the loops 421,412 on both sides of the rope 626 on the side to which the turnbuckle 430 is not connected. An end loop 622, which is different from the end loop 622, is configured to be detachably connected.

Each lateral rope 620 is prepared with any of the loops 421,412 on either side of each end loop 622 removed from the shackle 420.

In this state, the operator puts each lateral rope 602 at the head of the loop 412 on the side of each end loop 622 that is not connected to any of the end loops 622, and attaches the end loop 622 to the corresponding ring 532, 534. It penetrates through 536 and then connects its leading loop 412 to the shackle 420.

As a result, the end loop 622 this time is changed to the endless state (connected state), whereby the end loop 622 is wound around the corresponding support column 22 and connected.

A plurality of ladder support units in the plurality of vertical signboard systems 10, 400, 500, 600 described above, particularly a plurality of ropes (particularly 520, 530, 540, 620, etc.) and mounting brackets (particularly 210, 220, 550). Etc.) are attached to the standing signboard 20 together with the ladder 40 prior to the work, and when the work is completed, they are removed from the standing signboard 20 together with the ladder 40. It can be used as it is.

Of the plurality of ropes 520, 530, 540, 620, those that may block the line of sight of the person who sees the standing signboard 20 (hereinafter referred to as "viewer") are particularly the plurality of lateral ropes 520, 620. Is. The lateral ropes 520 and 620 are in a standby state waiting for the next work, that is, in a state where the lateral ropes 520 and 620 are hung on the standing sign 20 but the ladder 40 is removed from the lateral ropes 520 and 620. , Passing on the display surface 32 by a hanging route, the standing signboard 20 does not look good, and in some cases, the numbers displayed on the display surface 32 are covered with the lateral ropes 520 and 620, and the viewer May misunderstand the number.

Further, if the lateral ropes 520 and 620 that are in a relaxed state (playing) because they do not support the ladder 40 are shaken back and forth by a strong wind and collide with the display surface 32, a collision sound may be generated. Yes, doing so can be audibly unpleasant to nearby residents.

Various measures exist to reduce or eliminate these types of fears, one of which is that the vertical sign 20 has an elongated storage pocket (eg, an elongated box opened on an elongated upper surface, an elongated cross-sectional shape). There is a measure to install the (cylinder, etc.) in a posture extending in the lateral direction so as to substantially cover the entire width of the display board 30.

When this measure is taken, the worker first removes the ladder 40 from the lateral ropes 520 and 620 after the work using the ladder 40 is completed, and then removes the ladder 40 from the lateral ropes 520 and 620, and then the idle lateral ropes 520, A part of the 620 (for example, the most loose part) is stored in the storage pocket. In order to prevent the lateral ropes 520 and 620 from unexpectedly falling out of the storage pocket, it is desirable to attach a lid to the storage pocket so that the lid can be opened and closed, or to attach a hook for hooking the rope.

As described above, some of the exemplary embodiments of the present invention have been described in detail with reference to the drawings, but these are examples, and those skilled in the art, including the embodiments described in the [Summary of Invention] column. It is possible to carry out the present invention in other forms with various modifications and improvements based on knowledge.

Claims (8)

It is a signboard system
A signboard having a display board capable of displaying information on an information display surface which is at least one of the front surface and the back surface, and
Including a ladder used as a scaffolding for the worker to perform work on the information display surface.
The signboard is further
With at least one strut extending upward from the support surface,
A display board connector for connecting the display board to the at least one support column so as to be tiltable about the horizontal axis with respect to the vertical reference plane.
A display plate fixture for fixing the display plate to at least one support column in a posture in which the display plate is tilted at a target angle with respect to the vertical reference plane.
A standing signboard system including a ladder support unit that supports the ladder with respect to the standing signboard in a posture in which the display board is tilted in a generally the same direction as the tilting direction. In plan view, the signboard is fixedly installed near the inside of the boundary line of the area and generally parallel to the boundary line.
The standing signboard system according to claim 1, wherein the display board has a surface facing the outside of the area as the information display surface. In plan view, the signboard is fixedly installed near the inside of the boundary line of the area and generally parallel to the boundary line.
The display board has a front side display surface facing the center of the area and a back side display surface facing the outside of the area.
In order for the operator to perform work on the back side display surface, the display plate is provided with the display plate fixture so that the display plate is with respect to the vertical reference surface and the lower end portion of the display plate is from the upper end portion. Fixed in a tilted position approaching the center of the area
In order for the operator to work on the back side display surface, the ladder is tilted as the ladder moves from the lower side to the upper side of the display plate by the ladder support unit. The standing sign system according to claim 1, wherein the standing sign system is fixed in a tilted posture so as to extend in a direction generally parallel to the back display surface. The display board has an upper end portion and a lower end portion, and has an upper end portion and a lower end portion.
The standing sign system according to any one of claims 1 to 3, wherein the display board is supported with respect to at least one support column so that the display board can be tilted around a horizontal axis extending along the upper end portion. The at least one strut comprises a pair of strut extending horizontally with a gap in parallel with each other.
The lower end of the ladder is supported by the support surface, and the ladder can be tilted with the lower end as a fulcrum.
The ladder support unit is
At least one flexible first rope that is open or closed, passing the ladder laterally behind it to reach the pair of stanchions or via those struts. As such, supported by the pair of struts, each first rope has a length, which length is the vertical reference plane as the ladder approaches from the lower end to the upper end of the ladder in side view. It is possible to hold the rope in an inclined posture with respect to the vertical reference plane in a direction in which the horizontal distance from the rope becomes longer.
In the pair of struts, a support that supports each first rope so that the vertical position of each first rope is defined.
At least one second rope extending horizontally between the pair of struts in the vicinity of the support surface, in side view, by constant or temporary contact with the lower part of the ladder. The standing sign system according to any one of claims 1 to 4, wherein the unscheduled horizontal movement of the lower part of the ladder is restricted. The stand according to claim 5 , wherein the at least one first rope includes a plurality of first ropes so as to be different from each other with respect to a vertical position, and the first ropes have different lengths from each other. Signboard system. The at least one first rope is coated with a synthetic resin, and the synthetic resin provides a frictional force between the at least one first rope and each of the ladder and the pair of columns. The standing sign system according to any one of claims 5 or 6 to be increased. The ladder support unit is
During work, the upper part of the ladder is supported generally horizontally forward from behind it, thereby mechanically limiting the unplanned backward tilt of the upper part of the ladder from the target leaning position. A ladder upper stabilizer that dynamically stabilizes the upper part of the ladder,
Includes a ladder lower stabilizer that mechanically stabilizes the lower part of the ladder by mechanically limiting unplanned deviations in which the lower part of the ladder deviates horizontally from a predetermined area during work.
The at least one strut comprises a pair of strut extending horizontally with a gap in parallel with each other.
The ladder top stabilizer comprises at least one rope that extends generally horizontally while being supported by the pair of stanchions, the rope that extends the top of the ladder horizontally forward from behind it. , When the frictional force generated with the ladder is large, the relative slip to the ladder is prevented, while when the frictional force is small, the selective slip prevention state which allows the relative slip to the ladder is allowed. The standing sign system according to any one of claims 1 to 7, wherein the unplanned backward tilt is prevented by supporting the system.

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