JP5773216B2 - Ladder scaffolding - Google Patents

Description

  The present invention relates to a ladder scaffold that is installed on a ladder having a plurality of horizontal rails spanned between a pair of vertical rails.

  For example, in a building or various large-scale equipment, a ladder having a plurality of horizontal rails spanned between a pair of vertical rails may be installed for maintenance and inspection. Ladder scaffolds may be installed to increase safety during work or breaks. Similarly, a ladder scaffold may be installed on a portable ladder that is not fixed to a specific facility. As such a ladder scaffold, one described in Japanese Patent Laid-Open No. 2006-9500 (Patent Document 1) is known. The ladder scaffold of Patent Document 1 includes a connecting member (frame 11) fixed to a vertical beam (vertical beam 2), and a shaft member (supported by a pair of connecting members in parallel to the horizontal beam (horizontal beam 3)). A shaft member 12) and a scaffold member (scaffold member 13) supported rotatably about the shaft member are provided.

  The ladder scaffold of Patent Document 1 is provided with a shaft member at a position separated by a predetermined distance above a specific horizontal beam of interest (hereinafter referred to as “target horizontal beam”), and the shaft member is used as an axis. By rotating the scaffold member, the scaffold member can be accommodated within the longitudinal width of the vertical rail. Thereby, even in the telescopic ladder, it is possible to perform the telescopic operation without being affected by the scaffold member. In addition, since a predetermined interval can be easily secured between the target crosspiece and the shaft member in the vertical direction, an appropriate function as a ladder is ensured without affecting the lifting and lowering of the operator. .

  However, in the ladder scaffolding disclosed in Patent Document 1, the shaft member is disposed at a position spaced apart from the target horizontal rail by a predetermined distance. Therefore, when the scaffold member is stored, the horizontal rail on one level of the target horizontal rail is disposed. The size of the scaffold member is restricted in order to avoid interference. Therefore, unless the scaffold member is configured to be foldable by a connecting member (hinge 14) as shown in each drawing of Patent Document 1, an operator's mounting space is secured on the scaffold member. Is difficult. In addition, a member for supporting the scaffold member so that the upper surface of the scaffold member is horizontal (support member 16) needs to be provided separately on the connecting member, and a dedicated structure for holding the deployed posture of the scaffold member is required. .

JP 2006-9500 A

  The present invention has been made in view of the above circumstances, and provides a ladder scaffold that can secure a loading space with a simple configuration and improve the stability of an operator on a scaffold member. For the purpose.

A ladder scaffold according to the present invention is installed on a ladder having a plurality of horizontal rails spanned between a pair of vertical rails, and the first characteristic configuration thereof is the pair of vertical rails. A pair of connecting members fixed to each other, a shaft member supported by the pair of connecting members in parallel with the horizontal rail, and a scaffold member having a foot scene on which an operator is placed, The side of the ladder in which the operator moves up and down is the front side, and the opposite side is the back side, and the scaffold member rotates from the axial direction parallel to the shaft member by rotating about the shaft member as a rotation axis. Thus, the posture can be changed between a stowed posture in which the foot scene is positioned on the back side with respect to the ladder and a deployed posture in which the foot scene projects to the front side with respect to the ladder. Consists of usage in which an operator is placed on the scaffold member in the deployed posture In the in the scaffold member from the foot scene is configured to supported surface on the opposite side abuts the lateral beam,
In a use state where an operator is placed on the scaffold member in the unfolded posture, the supported surface of the scaffold member on the opposite side to the foot scene is configured to come into contact with the horizontal rail,
The scaffold member includes a main body portion on which the foot scene is formed, and an extending portion that extends downward from a portion of the main body portion on the back side of the vertical rail in the deployed posture, and the shaft member However, there exists in the point connected with the said extension part below the said horizontal rail contact | abutted to the said supported surface in the said use state .

According to this characteristic configuration, the scaffold member rotating around the shaft member supported between the pair of connecting members fixed to the pair of vertical bars can selectively adopt the storage posture and the deployment posture. . By setting the scaffold member in the storage posture, it is possible to ensure an appropriate function as a ladder without affecting the lifting and lowering of the worker. Further, by placing the scaffold member in the deployed posture, a loading space for the operator to rest and work or take a break can be formed on the scaffold member.
At this time, in a use state in which the operator is placed on the scaffold member in the unfolded posture, the supported surface of the scaffold member opposite to the foot scene comes into contact with the horizontal rail. In other words, in a use state, the scaffold member is supported by a horizontal beam that is normally a step beam (gripping beam) for ascending and descending the ladder. Thereby, the deployment posture of the scaffold member can be maintained without using a special mechanism by using the horizontal rail normally provided in the ladder. Therefore, a loading space can be formed with a simple configuration. In addition, the shaft member that serves as the rotation axis of the scaffold member has a height equivalent to that of the supporting horizontal beam on the back side of the horizontal beam that supports the scaffold member in use (hereinafter referred to as “support horizontal beam”) or It can be provided at a lower height. For this reason, it is difficult for the scaffold member to interfere with another horizontal beam (a horizontal beam on one stage of the support horizontal beam) arranged above the support horizontal beam, and the size of the scaffold member is hardly restricted. . Therefore, the scaffold member can be formed large within a range in which such interference does not occur. For example, a large mounting space can be secured without configuring the scaffold member so that it can be folded. Therefore, the stability of the operator on the scaffold member can be improved with a simple configuration in which the scaffold member is formed to be large within an allowable range.

A ladder scaffold according to the present invention is a ladder scaffold installed on a ladder having a plurality of horizontal rails spanned between a pair of vertical rails, and the second characteristic configuration thereof is the pair of vertical rails. A pair of connecting members respectively fixed to the crosspieces, shaft members supported by the pair of connecting members in parallel with the horizontal crosspieces, and a scaffold member having a foot scene on which an operator is placed. The side of the ladder where the operator moves up and down is the front side, the opposite side is the back side, and the scaffold member is viewed from the axial direction parallel to the shaft member by rotating about the shaft member as a rotation axis. In a side view, the posture is changed between a stowed posture in which the foot scene is positioned on the back side with respect to the ladder and an unfolded posture in which the foot scene projects to the front side with respect to the ladder. An operator is placed on the scaffold member in the deployed posture. In use state, said in the scaffold member from the foot scene is configured to supported surface on the opposite side abuts the lateral beam,
The rotation direction of the scaffold member when the posture is changed from the storage posture to the deployment posture is defined as a deployment direction, and the connecting member is in contact with the scaffold member in the deployment posture from a direction opposite to the deployment direction. have a contact supporting portion supporting the scaffold member,
The scaffold member forms a minute gap between the horizontal beam and the supported surface in contact with the supported surface in the use state when an operator is not placed on the foot scene in the deployed posture. It is in the point comprised as follows.

According to this characteristic configuration, the scaffold member rotating around the shaft member supported between the pair of connecting members fixed to the pair of vertical bars can selectively adopt the storage posture and the deployment posture. . By setting the scaffold member in the storage posture, it is possible to ensure an appropriate function as a ladder without affecting the lifting and lowering of the worker. Further, by placing the scaffold member in the deployed posture, a loading space for the operator to rest and work or take a break can be formed on the scaffold member.
At this time, in a use state in which the operator is placed on the scaffold member in the unfolded posture, the supported surface of the scaffold member opposite to the foot scene comes into contact with the horizontal rail. In other words, in a use state, the scaffold member is supported by a horizontal beam that is normally a step beam (gripping beam) for ascending and descending the ladder. Thereby, the deployment posture of the scaffold member can be maintained without using a special mechanism by using the horizontal rail normally provided in the ladder. Therefore, a loading space can be formed with a simple configuration. In addition, the shaft member that serves as the rotation axis of the scaffold member has a height equivalent to that of the supporting horizontal beam on the back side of the horizontal beam that supports the scaffold member in use (hereinafter referred to as “support horizontal beam”) or It can be provided at a lower height. For this reason, it is difficult for the scaffold member to interfere with another horizontal beam (a horizontal beam on one stage of the support horizontal beam) arranged above the support horizontal beam, and the size of the scaffold member is hardly restricted. . Therefore, the scaffold member can be formed large within a range in which such interference does not occur. For example, a large mounting space can be secured without configuring the scaffold member so that it can be folded. Therefore, the stability of the operator on the scaffold member can be improved with a simple configuration in which the scaffold member is formed to be large within an allowable range.
Further, the scaffold member in the deployed posture is supported from the opposite direction to the deployed direction by the contact support portion. When the operator is on the scaffold member in the unfolded posture, the scaffold member is supported by both the support crosspiece and the contact support portion. As a result, the load (moment) around the shaft member that acts on the scaffold member in use can be shared between the support crosspiece and the abutting support portion. Therefore, it can be used as a supporting horizontal rail without particularly increasing the strength of the horizontal rail provided in a general ladder. Further, the structure of the abutting support portion can be made relatively simple.
Further, the scaffold member in the unfolded posture abuts only on the abutting support portion without abutting on the supporting horizontal rail when the operator is not placed. That is, in such a state, the scaffold member is not supported by the support crosspiece but is supported only by the contact support portion. Therefore, for example, even when the scaffold member is changed from the stowed posture to the deployed posture, it is possible to avoid applying a load immediately to the supporting horizontal rail. In addition, since the load is applied to the support horizontal beam only when the worker is placed on the scaffold member in the deployed posture and the scaffold member is bent to some extent and the minute gap is eliminated, a sudden large load acts on the support horizontal beam. You don't have to consider what you can do. Therefore, it can be used as a supporting horizontal beam with little or no increase in strength of a horizontal beam provided on a general ladder.

The ladder scaffold according to the present invention is a ladder scaffold installed on a ladder having a plurality of horizontal rails spanned between a pair of vertical rails, and the third characteristic configuration thereof is the pair of vertical rails. A pair of connecting members respectively fixed to the crosspieces, shaft members supported by the pair of connecting members in parallel with the horizontal crosspieces, and a scaffold member having a foot scene on which an operator is placed. The side of the ladder where the operator moves up and down is the front side, the opposite side is the back side, and the scaffold member is viewed from the axial direction parallel to the shaft member by rotating about the shaft member as a rotation axis. In a side view, the posture is changed between a stowed posture in which the foot scene is positioned on the back side with respect to the ladder and an unfolded posture in which the foot scene projects to the front side with respect to the ladder. An operator is placed on the scaffold member in the deployed posture. In use, the in the scaffold member from the foot scene is configured to supported surface on the opposite side abuts the lateral beam,
  The rotation direction of the scaffold member when the posture is changed from the storage posture to the deployment posture is defined as a deployment direction, and the connecting member is in contact with the scaffold member in the deployment posture from a direction opposite to the deployment direction. A contact support portion for supporting the scaffold member;
  The scaffold member has a main body portion on which the foot scene is formed, and a protruding portion that protrudes outward from the main body portion along the axial direction, and the pair of connecting members are parallel to the vertical rail. It is formed in a plate shape, the shaft member is provided at a position on the back side of the vertical beam, and the projecting portion is provided between the vertical beam and the shaft member in a direction from the front side to the back side. The plate-like connecting member is configured to be in contact with the protruding portion of the scaffold member with the upper end portion as the contact support portion.

According to this characteristic configuration, the scaffold member rotating around the shaft member supported between the pair of connecting members fixed to the pair of vertical bars can selectively adopt the storage posture and the deployment posture. . By setting the scaffold member in the storage posture, it is possible to ensure an appropriate function as a ladder without affecting the lifting and lowering of the worker. Further, by placing the scaffold member in the deployed posture, a loading space for the operator to rest and work or take a break can be formed on the scaffold member.
  At this time, in a use state in which the operator is placed on the scaffold member in the unfolded posture, the supported surface of the scaffold member opposite to the foot scene comes into contact with the horizontal rail. In other words, in a use state, the scaffold member is supported by a horizontal beam that is normally a step beam (gripping beam) for ascending and descending the ladder. Thereby, the deployment posture of the scaffold member can be maintained without using a special mechanism by using the horizontal rail normally provided in the ladder. Therefore, a loading space can be formed with a simple configuration. In addition, the shaft member that serves as the rotation axis of the scaffold member has a height equivalent to that of the supporting horizontal beam on the back side of the horizontal beam that supports the scaffold member in use (hereinafter referred to as “support horizontal beam”) or It can be provided at a lower height. For this reason, it is difficult for the scaffold member to interfere with another horizontal beam (a horizontal beam on one stage of the support horizontal beam) arranged above the support horizontal beam, and the size of the scaffold member is hardly restricted. . Therefore, the scaffold member can be formed large within a range in which such interference does not occur. For example, a large mounting space can be secured without configuring the scaffold member so that it can be folded. Therefore, the stability of the operator on the scaffold member can be improved with a simple configuration in which the scaffold member is formed to be large within an allowable range.
  Further, the scaffold member in the deployed posture is supported from the opposite direction to the deployed direction by the contact support portion. When the operator is on the scaffold member in the unfolded posture, the scaffold member is supported by both the support crosspiece and the contact support portion. As a result, the load (moment) around the shaft member that acts on the scaffold member in use can be shared between the support crosspiece and the abutting support portion. Therefore, it can be used as a supporting horizontal rail without particularly increasing the strength of the horizontal rail provided in a general ladder. Further, the structure of the abutting support portion can be made relatively simple.
  Furthermore, by using the upper end portion of the connecting member formed in a plate shape parallel to the vertical beam, it is possible to configure a contact support portion having excellent strength without adding a special member to the connecting member. it can. Therefore, among the rotational loads around the shaft member acting on the scaffold member in the use state, the burden due to the abutment support portion can be increased, and the burden due to the support horizontal rail can be decreased. Thereby, it is possible to further reduce the need to increase the strength of the horizontal beam used as the supporting horizontal beam.

  Further, the ladder is fixed to the column of the article transporting apparatus including a traveling vehicle that travels along a traveling route and a lifting platform that moves up and down along a column that is erected on the traveling vehicle. In a state where a rotational load less than a predetermined reference value is applied to the scaffold member, it is preferable to provide a posture change restriction mechanism that restricts the posture change of the scaffold member.

  In a ladder scaffolding installed on a ladder fixed to a column that is erected on a traveling carriage of an article conveying device, for example, during operation of the article conveying device, vibration during traveling of the traveling carriage, inertia during acceleration / deceleration, etc. Therefore, a certain amount of rotational load may act on the scaffold member. According to this configuration, the posture change of the scaffold member can be mechanically controlled based on the magnitude relationship between the rotational load actually acting on the scaffold member and the predetermined reference value. That is, by restricting the posture change in a state where the rotational load acting on the scaffold member is less than the reference value, an unintended posture change during the operation of the article transporting device can be suppressed. Further, in this configuration, the posture change regulation mechanism allows the posture change in a state where the rotational load acting on the scaffold member is equal to or higher than the reference value. Thereby, it is possible to appropriately change the posture when necessary.

The perspective view which shows the whole automatic warehouse structure provided with the article conveyance apparatus in which the scaffold for ladders was installed Side view showing how the ladder scaffolding is installed on the ladder Perspective view of ladder scaffold with storage of scaffold members Perspective view of ladder scaffolding with scaffold members deployed Side view showing detailed structure of ladder scaffolding Top view showing the detailed structure of the ladder scaffolding Front view showing detailed structure of ladder scaffolding Partial enlarged view of FIG. Enlarged side view of ladder scaffold in use Schematic showing how to use the scaffold member The perspective view which shows another embodiment of the scaffold for ladders The perspective view which shows another embodiment of the scaffold for ladders

  An embodiment of a ladder scaffold according to the present invention will be described with reference to the drawings. The ladder scaffold 1 according to this embodiment is installed on a ladder 8 and provides a scaffold for an operator M (see FIG. 10) to work and take a break. In the present embodiment, a ladder scaffold 1 installed on a ladder 8 provided in an article conveyance device 7 in an automatic warehouse will be described as an example. Hereinafter, the overall configuration of the article transport device 7, the configuration of the ladder scaffold 1, and the posture holding structure of the ladder scaffold 1 will be described in this order.

  In the following description, the “front side” represents the side on which the worker M moves up and down based on the position of the ladder 8, and the “rear side” represents the opposite side. Further, the position and direction of each member constituting the scaffold member 40 provided in the ladder scaffold 1 represent the position and direction of the scaffold member 40 in the deployed posture (described later) unless otherwise specified. Moreover, the term regarding the position and direction about each member is used as a concept including the state which has the difference by the error which can be accept | permitted on manufacture.

1. Overall Configuration of Article Conveying Device The overall configuration of the article conveying device 7 will be described with reference to FIGS. 1 and 2. The article transporting device 7 is provided adjacent to a storage shelf 76 having storage units for storing articles regularly arranged vertically and horizontally. The article conveyance device 7 conveys articles stored in the storage shelf 76 or taken out from the storage shelf 76. The article conveying device 7 is a stacker crane including a traveling carriage 71, a lifting platform 73, and a control unit 78.

  The traveling carriage 71 travels along the traveling rail 77 on a traveling rail 77 installed on the floor of the building. The traveling rail 77 is provided along the left-right alignment direction (the horizontal direction in this example) of the plurality of storage units in the storage shelf 76. That is, the traveling carriage 71 travels along the traveling direction T along the left-right alignment direction of the plurality of storage units in the storage shelf 76. In the present embodiment, the route along which the traveling carriage 71 travels along the traveling rail 77 corresponds to the “traveling route” in the present invention.

  A prop 72 is erected on the traveling carriage 71. Here, a pair of support columns 72 are erected along a direction orthogonal to the traveling direction T (in the present embodiment, the vertical direction V which is also the vertical arrangement direction of the plurality of storage units). The pair of struts 72 are respectively erected at both ends of the traveling carriage 71 in the traveling direction T.

  A lifting platform 73 is provided between the pair of columns 72. The lifting platform 73 is provided so as to engage with each of the pair of support columns 72 and moves up and down along the pair of support columns 72. The lifting platform 73 moves up and down along the vertical alignment direction of the plurality of storage units in the storage shelf 76. The lifting platform 73 is provided with a transfer device (fork device) having an article holding portion. The transfer device is configured to be able to deliver an article between the article conveying device 7 and the storage shelf 76 by moving the article holding unit out of and behind.

  The control unit 78 controls the traveling of the traveling carriage 71 along the traveling rail 77 and the elevation of the lifting platform 73 along the pair of columns 72. In addition, the control unit 78 also controls the withdrawal and the like of the article holding unit in the transfer device. Thereby, the control unit 78 can move the lifting platform 73 to the position of the specific storage unit (specific storage unit), and can transfer articles by the transfer device at the position of the specific storage unit. it can.

  The article transport apparatus 7 according to the present embodiment includes a ladder 8 for maintenance / inspection of the article transport apparatus 7. In the present embodiment, the ladder 8 is fixed to one of a pair of support columns 72 erected on the traveling carriage 71 by a fixing member 86 (see FIG. 2). When the traveling carriage 71 travels on the traveling rail 77 along the traveling direction T, the ladder 8 also moves along the traveling direction T integrally with the traveling carriage 71.

  As shown in FIGS. 3 and 4, the ladder 8 includes a pair of vertical bars 81 and a plurality of horizontal bars 84 spanned between the pair of vertical bars 81 (see also FIG. 10). In the present embodiment, the pair of vertical bars 81 are arranged in parallel to each other along the columns 72 and at a predetermined interval. The plurality of horizontal bars 84 are arranged orthogonally to the vertical bars 81 and parallel to each other at regular intervals. Each horizontal beam 84 serves as a step beam when the worker M ascends and descends the ladder 8. The vertical beam 81 and the horizontal beam 84 are configured using a metal material. Examples of the metal material include aluminum and stainless steel.

2. Configuration of Ladder Scaffolding As shown in FIG. 2, in this embodiment, a ladder scaffolding 1 is installed at one place in the middle portion of the vertical rail 81 in the vertical direction. The structure of such a ladder scaffold 1 will be described with reference to FIGS. As shown in these drawings, the ladder scaffold 1 includes a connecting member 20, a shaft member 30, and a scaffold member 40. In the ladder scaffold 1 according to the present embodiment, the scaffold member 40 rotates between the retracted posture (see FIG. 4) and the deployed posture (see FIG. 4) by rotating the shaft member 30 about the rotation shaft. It is configured as a possible movable scaffold.

  The connecting member 20 is a member for connecting the ladder 8 that is the installation target of the ladder scaffold 1 and the scaffold member 40 that is a main component of the ladder scaffold 1. The connecting member 20 is configured using a metal material. Examples of the metal material include aluminum and stainless steel. Further, the connecting member 20 is formed in a flat plate shape parallel to the vertical beam 81 as a whole, except for the stopper portion 22.

  In the present embodiment, a pair of such connecting members 20 are provided, and the pair of connecting members 20 are respectively fixed to a pair of vertical bars 81 constituting the ladder 8. As shown in FIGS. 6 and 7, in this example, a pair of flat plate-like connecting members 20 fixed to the outside of each vertical beam 81 are arranged in parallel so as to face each other with the ladder 8 sandwiched in the width direction. Yes. As shown in FIG. 5, each connecting member 20 extends from the center in the width direction of the vertical beam 81 toward the back side in a side view as viewed from the axial direction A parallel to the shaft member 30. . Each connecting member 20 is fixed to the vertical beam 81 by a plurality of (four in this example) fastening members 61 in an area overlapping with the vertical beam 81. In this example, the fastening member 61 includes a nut (U nut) that is locked to a groove 82 provided in the vertical beam 81 along the extending direction of the vertical beam 81, and a bolt that is screwed to the nut. It is configured.

  As shown in FIGS. 6 and 7, the shaft member 30 is supported by the pair of connecting members 20 in parallel with the horizontal rail 84. The shaft member 30 is spanned between the pair of connecting members 20 in parallel with the horizontal rail 84 and fixed. The shaft member 30 functions as a rotation shaft (rotation center) for changing the posture of the scaffold member 40. The shaft member 30 is configured using a metal material. Examples of the metal material include aluminum and stainless steel. As shown in FIG. 5, the shaft member 30 spanned between the pair of connecting members 20 extending to the back side of the vertical beam 81 is disposed on the back side with respect to the vertical beam 81 and the horizontal beam 84. Yes.

  As shown in FIGS. 6 and 7, a scaffold member 40 is provided between the pair of connecting members 20. Each of the following members constituting the scaffold member 40 is made of a metal material. Examples of the metal material include aluminum and stainless steel. The scaffold member 40 includes a foot scene 40a that is a surface on which the worker M is placed. In addition, the scaffold member 40 is configured to be able to change its posture between a storage posture (see FIG. 3) and a deployed posture (see FIG. 4) by rotating about the shaft member 30 as a rotation axis. Here, the “storage posture” is a state in which the foot scene 40a is located on the back side with respect to the ladder 8 in a side view as viewed from the axial direction A parallel to the shaft member 30 (in this example, the entire scaffold member 40 Represents a posture in a state of being positioned on the back side with respect to the ladder 8. On the other hand, the “deployed posture” represents a posture in which the foot scene 40a protrudes to the front side with respect to the ladder 8.

  In the present embodiment, the scaffold member 40 includes a plurality of partial scaffold members separated from each other along the axial direction A. As shown in FIG.6 and FIG.7, in this embodiment, the scaffold member 40 has two partial scaffold members (1st scaffold member 40X, 2nd scaffold member 40Y). In the present embodiment, the first scaffold member 40X and the second scaffold member 40Y are provided apart from each other in a state of being aligned along the axial direction A. The first scaffold member 40X and the second scaffold member 40Y are supported by a single shaft member 30 so as to be rotatable. Specifically, the first scaffold member 40X is rotatably supported on one side of the shaft member 30 in the axial direction A (right side in FIG. 6), and the other side of the axial direction A is separated by a spacer 31 with a predetermined interval. The second scaffold member 40Y is rotatably supported at (left side in FIG. 6). Thereby, the first scaffold member 40X and the second scaffold member 40Y can be independently changed in posture. In the present embodiment, the width of the first scaffold member 40X (main body portion 41), the width of the spacer 31, and the width of the second scaffold member 40Y (main body portion 41) along the axial direction A are approximately the same. . The width of the first scaffold member 40X and the width of the second scaffold member 40Y may be set larger than the width of the spacer 31.

  As shown in FIG. 5, the first scaffold member 40 </ b> X includes a main body portion 41 and an extension portion 49 that are connected to each other. A foot scene 40a is formed on the main body 41, and when the first scaffold member 40X is in the unfolded posture, the worker M rests on the foot scene 40a to work or take a break. A loading space S is formed. As shown in FIGS. 6 and 7, the main body 41 is fixed so as to cover the two vertical struts 42 extending in the direction orthogonal to the axial direction A and to cover the two vertical struts 42. And a top plate 43. In the present embodiment, the vertical support column 42 is configured by a pipe member having a rectangular frame-shaped cross section, and the top plate 43 is configured by a flat plate-shaped member having a rectangular plan view shape. The “plan view” of the top plate 43 is a state viewed from a direction perpendicular to the flat plate member constituting the top plate 43. In the deployed posture of the first scaffold member 40X, the top plate 43 is placed on the two vertical columns 42 (see FIG. 7). In the present embodiment, a foot scene 40 a of the scaffold member 40 is configured by the upper surface of the top plate 43. Further, the top plate 43 is bent downward at the front side end of the vertical column 42 and covers the opening on the front side of the vertical column 42 (see FIG. 5).

  As shown in FIGS. 5 to 7, the main body 41 is configured to extend to both the front side and the back side with respect to the vertical rail 81 in the deployed posture of the scaffold member 40. And the mounting space S is formed in the part of the main-body part 41 extended in the front side in the expansion | deployment attitude | position of the scaffold member 40. FIG.

  The extending portion 49 is a member that connects and supports the main body portion 41 and the shaft member 30. As shown in FIG. 6, the extending part 49 is formed in a rectangular parallelepiped shape that opens to the front side (see also FIG. 4). In the present embodiment, the extending portion 49 is formed by vertically bending both end portions of a rectangular flat plate member so as to face each other. Through holes are formed at positions corresponding to each other of the pair of opposing wall portions 49a, and the shaft member 30 is inserted through these through holes. The through hole of the extension part 49 and the outer peripheral surface of the shaft member 30 are slidable in the circumferential direction. A bearing (such as a rolling bearing or a sliding bearing) may be disposed between the two.

  As shown in FIG. 5, the extending portion 49 is connected to the main body portion 41 so as to extend downward from a portion of the main body portion 41 on the back side with respect to the vertical rail 81 in the deployed posture of the scaffold member 40. Yes. That is, the main body portion 41 and the extending portion 49 are connected to each other so as to exhibit a bent shape as viewed from the side in the axial direction A. In the present embodiment, the main body portion 41 and the extending portion 49 are connected so as to be orthogonal to each other and to exhibit an L shape in a side view. Furthermore, in the present embodiment, the main body 41 is disposed along the horizontal direction in the deployed posture of the scaffold member 40, and the extending portion 49 is disposed along the vertical direction V below the main body 41. And the shaft member 30 is provided in the front-end | tip part which is the edge part on the opposite side to the main-body part 41 in the extension part 49 (opposing wall part 49a). The length in the side view is set to be longer in the main body 41 than in the extending portion 49. In the present embodiment, the length of the main body 41 in a side view is set to be approximately the same as the interval between a pair of upper and lower horizontal bars 84 (for example, 70% to 110%). On the other hand, the length of the extended portion 49 in a side view is set to be sufficiently smaller (for example, 20% to 40%) than the interval between the pair of horizontal bars 84.

  As shown in FIGS. 5 and 6, the first scaffold member 40 </ b> X has a horizontal strut 46 fixed to a connecting portion between the two vertical struts 42 and the extending portion 49 so as to be in contact with both. In this embodiment, the horizontal support | pillar 46 is comprised by the pipe member which has a rectangular frame-shaped cross-sectional shape. The horizontal struts 46 extend along the axial direction A and are disposed so as to be orthogonal to the vertical struts 42. The vertical struts 42 and the horizontal struts 46 are arranged so that their upper surfaces are flush with each other. In the unfolded posture of the first scaffold member 40X, the top plate 43 is also placed on the horizontal support 46. The vertical column 42, the horizontal column 46, and the top plate 43 are joined together by welding or the like.

  Here, the width of the horizontal strut 46 along the axial direction A is set to a value larger than the width of the top plate 43 constituting the main body 41. Therefore, in the first scaffold member 40X, the horizontal struts 46 are axially moved from the top plate 43 in a state in which they are arranged with the end portions on the inner side in the axial direction A (the left side in FIG. 6 being the spacer 31 side) aligned. A portion protruding outward (right side in FIG. 6) along A is included. In the present embodiment, a portion of the horizontal strut 46 that overlaps the top plate 43 in plan view of the top plate 43 can be included in the main body portion 41. On the other hand, a portion of the horizontal strut 46 that extends outward without overlapping the top plate 43 in a plan view of the top plate 43 becomes a protruding portion 45 that protrudes outward from the main body portion 41.

  Further, as shown in FIGS. 5 to 7, in the present embodiment, a reinforcing plate 47 that is bent and formed in an L shape in a side view as viewed from the axial direction A at the boundary between the main body 41 and the protrusion 45. Is provided. The reinforcing plate 47 has one L-shaped first portion 47 a entirely in contact with the front side surface of the horizontal column 46 that constitutes the protruding portion 45, and the L-shaped side surface that constitutes the main body portion 41. 42 is provided so as to be in contact with the outer side surface. The reinforcing plate 47 is provided such that the lower surface of the other L-shaped second portion 47b is positioned slightly below the lower surface of the vertical support column 42 (see FIG. 8). The reinforcing plate 47 is joined and integrated with the vertical column 42 and the horizontal column 46 by welding or the like. In the present embodiment, this reinforcing plate 47 is also included in the protruding portion 45 extending outward from the main body portion 41.

  As shown in FIG. 5, the protrusion 45 is provided between the vertical beam 81 and the shaft member 30 in a direction (horizontal direction) from the front side to the back side. Here, most of the protrusion 45 is provided between the vertical beam 81 and the shaft member 30 in the horizontal direction. That is, a part of the protrusion 45 may be disposed outside the above range in the horizontal direction. In the present embodiment, the reinforcing plate 47 constituting the projecting portion 45 is provided at a position on the back side of the vertical rail 81 and on the front side of the shaft member 30 in the horizontal direction. Further, the horizontal struts 46 constituting the protrusions 45 are provided at the same horizontal position as the shaft member 30, and a part thereof is disposed at a position on the front side of the shaft member 30. The other part of the horizontal strut 46 is disposed at a position on the back side of the shaft member 30.

  The second scaffold member 40Y has a configuration similar to that of the first scaffold member 40X described above. Therefore, detailed description of the second scaffold member 40Y is omitted. As shown in FIGS. 6 and 7, the first scaffold member 40X and the second scaffold member 40Y are arranged in plane symmetry with each other, and the directivity along the axial direction A for each member is opposite to each other. It becomes. In the following description, when there is no need to particularly distinguish the first scaffold member 40X and the second scaffold member 40Y, both are simply described as “scaffold member 40”.

3. Next, the posture holding structure of the ladder scaffold 1 having the above-described configuration will be described mainly with reference to FIGS. Here, a structure for holding the scaffold member 40 in the deployed posture will be mainly described. In the following, “deployment direction R1” represents the rotation direction of the scaffold member 40 that rotates about the shaft member 30 as a rotation axis when the posture is changed from the storage posture to the deployment posture, and “storage direction R2” represents the deployment direction. The rotation direction when the posture is changed from the posture to the storage posture is represented (see FIG. 5).

  The ladder scaffolding 1 according to the present embodiment is a horizontal beam 84 that normally serves as a stepping beam (gripping beam) for ascending and descending the ladder 8 when the worker M is placed on the scaffolding member 40 in the deployed posture. A structure for holding the deployed posture of the scaffolding member 40 is used. That is, the scaffold member 40 is supported by the crosspieces 84 in use. Details will be described below. In the following, the horizontal beam 84 that supports the scaffold member 40 in use is referred to as “support horizontal beam 84A” for the purpose of distinguishing from the other horizontal beam 84.

  As described above, the scaffold member 40 is configured to be rotatable about the shaft member 30 as a rotation axis. The scaffold member 40 rotates toward the deployment direction R1 when the posture is changed from the storage posture to the deployed posture. At this time, in this embodiment, as shown in FIG. 5, the connecting member 20 contacts the scaffold member 40 in the deployed posture from the direction opposite to the deployment direction R1 (toward the storage direction R2). A contact support portion 21 that supports the support 40 is provided. In the present embodiment, the contact support portion 21 is configured to support the scaffold member 40 by contacting the scaffold member 40 in the deployed posture from below.

  This point will be described in more detail. The pair of flat plate-like connecting members 20 fixed to the pair of vertical bars 81 has a shape in which each upper end extends along a virtual plane including the upper surface of the support horizontal bar 84A (see FIG. 8). . That is, the upper surface of the supporting horizontal beam 84A and the upper end portion of the connecting member 20 are arranged so as to be aligned on the same plane. On the other hand, in the protruding portion 45 protruding outward from the main body portion 41 of the scaffold member 40, the lower surface of the second portion 47 b of the reinforcing plate 47 is positioned slightly below the lower surface of the horizontal strut 46 in the vertical direction V. The positional relationship between the two is set. In the present embodiment, the vertical struts 42 and the horizontal struts 46 are arranged so that their lower surfaces are flush with each other. Thereby, the lower surface of the second portion 47 b of the reinforcing plate 47 is positioned slightly below the vertical direction V from the lower surface of the vertical column 42.

  When the scaffold member 40 is rotated in the deployment direction R1 to the deployment posture (here, the posture in the state of being rotated to the deployment direction R1 side most within the movable range), first, the scaffold member 40 protrudes from the upper end portion of the connecting member 20. The portion 45 (here, the second portion 47b of the reinforcing plate 47) abuts (see FIG. 8). That is, the upper end portion of the connecting member 20 and the projecting portion 45 abut before the support cross beam 84A and the main body portion 41 of the scaffold member 40 abut. The scaffold member 40 is configured such that the first supported surface 40b of the protruding portion 45 abuts on the upper end portion of the connecting member 20 regardless of whether or not the worker M is placed in the deployed posture. In this example, the lower surface of the second portion 47b of the reinforcing plate 47 constituting the protruding portion 45 is the first supported surface 40b. Further, the upper end portion of the connecting member 20 that contacts the first supported surface 40 b of the protruding portion 45 from below and supports the scaffold member 40 is the contact support portion 21.

  The scaffold member 40 abuts when the abutment support portion 21 and the first supported surface 40b abut and the worker M is not placed on the scaffold member 40 in the deployed posture (unused state). It is supported only by the support portion 21 and is held in the deployed posture (see FIG. 8). That is, the scaffold member 40 is configured to form a minute gap G between the upper surface (support surface 84Aa) of the supporting horizontal rail 84A and the second supported surface 40c of the main body 41 when not in use. . In other words, the scaffold member 40 is disposed at a position facing the support crosspiece 84A in a state where a minute gap G is formed between the support surface 84Aa and the second supported surface 40c in an unused state. The interval of the minute gap G is preferably set in consideration of the amount of bending that may occur in the scaffold member 40 when the worker M is placed on the scaffold member 40. For example, the thickness of the main body 41 of the scaffold member 40 may be 0.1% to 10%, and more preferably 1% to 5%. In the example shown in FIG. 8, it is set to about 3%. In this example, the lower surface of the vertical column 42 constituting the main body 41 is the second supported surface 40c. The second supported surface 40c is a surface opposite to the foot scene 40a (the upper surface of the top plate 43 constituting the main body portion 41) in the scaffold member 40. In the present embodiment, the second supported surface 40c corresponds to the “supported surface” in the present invention.

  Thereafter, when the worker M is placed on the unused scaffold member 40, the scaffold member 40 is kept in a state where the contact support portion 21 and the first supported surface 40 b are in contact with each other due to the weight of the worker M. Deflection occurs. Here, the scaffold member 40 (particularly the main body portion 41) in a posture in a state of being rotated most toward the deployment direction R1 within the movable range bends so as to be further displaced toward the deployment direction R1. Due to such bending, the minute gap G existing between the support surface 84Aa and the second supported surface 40c in the unused state is eliminated. Then, as shown in FIG. 9, the second supported surface 40c abuts on the support surface 84Aa of the support horizontal rail 84A in a state where the worker M is placed on the scaffold member 40 in the unfolded posture (use state). That is, in use, the scaffold member 40 is supported by the support horizontal rail 84A.

  As described above, in the present embodiment, the second supported surface 40c of the scaffold member 40 is in contact with the support lateral beam 84A in a use state where the worker M is placed on the scaffold member 40 in the unfolded posture, and the scaffold member 40 is supported. It is configured to be supported by the horizontal beam 84A. In use, the first supported surface 40 b of the scaffold member 40 contacts the upper end portion (contact support portion 21) of the connecting member 20, and the scaffold member 40 is also supported by the contact support portion 21. In other words, in the use state, the scaffold member 40 is supported at two points by both the support crosspiece 84 </ b> A and the contact support portion 21. Thereby, the rotation load (moment) around the shaft member 30 acting on the scaffold member 40 by the weight of the worker M in the use state can be shared and borne by the support horizontal beam 84A and the contact support portion 21. .

  Here, the supporting horizontal rail 84A is one of a plurality of horizontal rails 84 that are used as stepping rails (gripping bars) when the worker M ascends and descends the ladder 8. It is provided. Further, the connecting member 20 is a member necessary for connecting the ladder 8 (here, the vertical beam 81) and the scaffold member 40 while supporting the shaft member 30 serving as the rotation shaft of the scaffold member 40. In this way, by using the crosspiece 84 ordinarily provided on the ladder 8 or the connecting member 20 for installing the ladder scaffold 1 on the ladder 8, the deployed posture of the scaffold member 40 is maintained without providing a special mechanism. It is possible. That is, it is possible to ensure an appropriate function as the movable ladder scaffolding 1 while suppressing an increase in cost by suppressing an increase in the number of parts.

  Further, the contact support portion 21 can be configured without adding a special member to the connection member 20 by using the upper end portion of the connection member 20 formed in a flat plate shape. Further, the entire flat connecting member 20 abuts on the first supported surface 40b in a state orthogonal to the first supported surface 40b of the scaffold member 40 when viewed from the front side of the ladder 8 ( Therefore, the contact support portion 21 having relatively high strength can be configured. Thereby, out of the rotational load acting on the scaffold member 40 in the use state, it is possible to increase the burden due to the abutment support portion 21 and decrease the burden due to the support crosspiece 84A. Therefore, it is possible to maintain the deployed posture of the scaffold member 40 using the horizontal beam 84 that is normally provided in the ladder 8, while reducing the need to increase the strength of the horizontal beam 84 used as the supporting horizontal beam 84A. be able to.

  Further, in the present embodiment, in the unused state before reaching the usage state, the support crosspiece 84A and the scaffold member 40 face each other with a minute gap G therebetween, and the scaffold member 40 is supported only by the contact support portion 21. . For this reason, when the scaffold member 40 is changed from the stowed posture to the deployed posture, it is avoided that a rotational load is immediately applied to the supporting horizontal rail 84A. Then, when the worker M is placed on the scaffold member 40 in the unfolded posture and the scaffold member 40 is bent to some extent and the minute gap G is eliminated, a rotational load is applied to the support lateral beam 84A. Therefore, it is possible to reduce the necessity of designing the strength of the support horizontal beam 84A in consideration of the fact that a sudden large load can act on the support horizontal beam 84A. In some cases, the horizontal beam 84 provided on the general ladder 8 can be used as it is as the supporting horizontal beam 84A without reinforcing the strength at all.

  Further, in the present embodiment, of the main body part 41 and the extension part 49 connected so as to exhibit an L shape in a side view in the scaffold member 40, the extension part 49 is more than the vertical beam 81 in the main body part 41. It is comprised so that it may extend below from the part on the back side. The shaft member 30 is provided in a portion of the extending portion 49 below the support horizontal rail 84A in the vertical direction V in relation to the support horizontal rail 84A. In this example, the shaft member 30 is provided at the distal end portion of the extending portion 49 opposite to the main body portion 41. Therefore, when the scaffold member 40 is in the storage posture, a space that is large enough to accommodate the toe and the like of the worker M is formed between the supporting cross beam 84A and the main body portion 41 of the scaffold member 40. (See FIG. 5). At this time, the length of the extension part 49 in a side view is sufficiently smaller than the interval between the pair of horizontal bars 84 adjacent in the vertical direction. Therefore, the main body portion 41 and the extending portion 49 of the scaffold member 40 do not reach the vicinity of the lower adjacent horizontal beam 84B adjacent to the lower side of the support horizontal beam 84A. Therefore, it is possible to minimize the influence on the ascending / descending of the worker M by installing the ladder scaffold 1 as described above on the ladder.

  Further, in the shape of the scaffold member 40 and the arrangement configuration of the shaft member 30 as described above, the upper adjacent horizontal beam 84C adjacent to the upper side with respect to the support horizontal beam 84A, and the scaffold member 40 that rotates about the shaft member 30 as the rotation axis. Interference is unlikely to occur. That is, since the scaffold member 40 can be rotated through the entire space between the supporting horizontal beam 84A and the upper adjacent horizontal beam 84C, the size of the scaffold member 40 (in particular, the main body portion 41 in this case) is restricted. There is almost nothing. Therefore, the scaffold member 40 (main body portion 41) can be formed large within a range where interference with the upper adjacent horizontal crosspiece 84C does not occur, and as a result, a large loading space S can be secured. Thereby, the stability of the worker M on the scaffold member 40 can be improved with a simple configuration in which the scaffold member 40 is formed to be large within an allowable range.

  By the way, in this embodiment, the ladder 8 on which the ladder scaffold 1 is installed is fixed to a support column 72 erected on a traveling carriage 71 provided in the article transport device 7 as shown in FIGS. 1 and 2. Yes. For this reason, the ladder 8 also moves along the traveling direction T as the traveling carriage 71 travels on the traveling rail 77. At that time, while the traveling carriage 71 is traveling, a predetermined rotational load may act on the scaffold member 40 due to vibration. Further, when the traveling carriage 71 starts to travel or stops, a predetermined rotational load may act on the scaffold member 40 due to inertia or the like. Therefore, the ladder scaffold 1 according to the present embodiment further includes a posture change regulation mechanism 50 that regulates a posture change of the scaffold member 40 under a predetermined condition.

  As shown in FIG. 7, in the present embodiment, the engagement projection 51 and the engagement recess 52 that are provided separately from each other in the connection member 20 and the extension portion 49 of the scaffold member 40 are arranged in a posture. A change regulation mechanism 50 is configured. In this example, the engagement is biased toward the outside in the axial direction A by an elastic member such as a spring between the connection portion of the extension portion 49 with the main body portion 41 and the connection portion with the shaft member 30. A convex portion 51 is provided. As such an engaging projection 51, a ball plunger is used in this example. In addition, an engagement recess 52 having a shape corresponding to the shape of the engagement protrusion 51 is provided at the position of the connecting member 20 corresponding to the position of the engagement protrusion 51 in each of the storage posture and the deployment posture of the scaffold member 40. ing. As shown in FIG. 5, in this example, the engagement recess 52 for the storage posture is provided at the same height as the connecting portion with the shaft member 30 and on the back side. In addition, an engaging recess 52 for a deployment posture is provided above the same horizontal position as the connecting portion with the shaft member 30.

  The posture change regulation mechanism 50 regulates the posture change of the scaffold member 40 in a state where a rotational load less than a predetermined reference value is acting on the scaffold member 40 (low load state). This reference value can be set in advance by experimentally obtaining a rotational load that can act on the scaffold member 40 in the storage position during the operation of the article conveying device 7. In the low load state, the posture change restricting mechanism 50 keeps the scaffold member 40 in the storage posture in the storage posture as it is. Further, the scaffold member 40 in the deployed posture is maintained in the deployed posture as it is. By including such a posture change regulation mechanism 50, an unintended posture change of the scaffold member 40 due to vibration during traveling of the traveling carriage 71, inertia during acceleration / deceleration, and the like during operation of the article conveying device 7 is suppressed. Can do.

  On the other hand, the posture change regulation mechanism 50 allows the posture change of the scaffold member 40 when a rotational load equal to or greater than the reference value is applied to the scaffold member 40. For example, when a load is applied to the scaffold member 40 by the worker M using the limbs to rotate the scaffold member 40, the posture change from the storage posture to the deployed posture or the deployed posture according to the direction of the rotational load. The posture change from the storage posture to the storage posture is allowed. Thereby, a posture change can be appropriately generated according to the use request of the worker M.

  The posture change of the scaffold member 40 in the storage posture is restricted to some extent not only by the posture change restriction mechanism 50 but also by the stopper portion 22 provided in the connecting member 20. The stopper portion 22 is configured to support the scaffold member 40 by contacting the scaffold member 40 in the retracted position from the direction opposite to the storage direction R2 (toward the deployment direction R1). In the present embodiment, the stopper portion 22 is connected to each connecting member 20 so that the upper surface of the stopper portion 22 abuts the lower surface of the extending portion 49 of the scaffold member 40 in the stowed posture (the surface on the back side in the deployed posture). To the inner side in the axial direction A. Thereby, the stopper part 22 controls that the scaffold member 40 in the storage posture further rotates in the storage direction R2 side. The stopper portion 22 is provided at a position on the most back side of the connecting member 20 in the horizontal direction. In this example, it is provided below the same horizontal position as the engaging recess 52 for the storage posture.

  The ladder scaffold 1 according to the present embodiment can be used as shown in FIG. 10, for example. Here, in the initial state, both the first scaffold member 40X and the second scaffold member 40Y are in the storage posture. These are appropriately maintained in the stored posture by the posture change restriction mechanism 50 and the stopper portion 22. When the worker M who has climbed up the ladder 8 reaches a position where the ladder scaffold 1 can be reached, the scaffold member can pull out one of the first scaffold member 40X and the second scaffold member 40Y to the front side by hand. A rotational load in the developing direction R <b> 1 is applied to 40. By applying a rotational load that is equal to or greater than a predetermined reference value, the scaffold member 40 assumes a deployed posture. In addition, a rotational load is not applied to the other of the first scaffold member 40X and the second scaffold member 40Y, and the storage position is maintained.

  In the deployed posture of the scaffold member 40, the scaffold member 40 is in a state of protruding to the front side with respect to the ladder 8, and thus the lifting and lowering of the worker M may be hindered by the scaffold member 40 in the deployed posture. In this regard, in the present embodiment, the first scaffold member 40X and the second scaffold member 40Y can be independently changed in posture, and the first scaffold member 40X and the second scaffold member 40Y can be changed as described above. Only one side can be in the deployed position and the other in the stored position. At this time, in this embodiment, the width of the first scaffold member 40X along the axial direction A, the width of the spacer 31, and the width of the second scaffold member 40Y are approximately the same. A space through which M can pass can be formed. That is, while the part of about 1/3 of the width of the ladder 8 is hindered by the scaffold member 40 in the deployed position, the scaffold member 40 is in the storage position in the remaining 2/3 part. In the first place, since the scaffold member 40 does not exist, the raising and lowering of the worker M is not hindered. Therefore, the worker M can ascend the ladder 8 so as to pass through one side of the first scaffold member 40X and the second scaffold member 40Y in the deployed posture.

  When the worker M eventually reaches a position above the ladder scaffold 1, the other side of the first scaffold member 40 </ b> X and the second scaffold member 40 </ b> Y maintained in the storage posture is pulled out to the front side by hand. A rotational load in the deployment direction R1 is applied to the scaffold member 40. The worker M can perform this operation in a stable posture with one foot on the scaffold member 40 that has already been in the deployed posture. By applying a rotational load that is equal to or greater than a predetermined reference value, the scaffold member 40 assumes a deployed posture. The loading space S is formed on each of the scaffold members 40 in a state where both the first scaffold member 40X and the second scaffold member 40Y are in the deployed posture. The worker M can perform maintenance and inspection operations in a stable posture with both feet on one or both of the first scaffold member 40X and the second scaffold member 40Y. The worker M can get off the ladder 8 by performing the above operations in the reverse order.

  In addition, the usage method demonstrated here is an example to the last. Of course, the worker M can use the ladder scaffold 1 in various ways.

4). Other Embodiments Finally, other embodiments of the ladder scaffolding according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In the above-described embodiment, the configuration in which the scaffold member 40 includes two partial scaffold members (the first scaffold member 40X and the second scaffold member 40Y) has been described as an example. However, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 11, the scaffold member 40 may be configured as a single member extending in the entire axial direction A. Further, the scaffold member 40 may be composed of three or more partial scaffold members.

(2) In the above embodiment, the configuration in which the first scaffold member 40X and the second scaffold member 40Y are provided apart from each other along the axial direction A has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the spacer 31 may not be provided between the first scaffold member 40X and the second scaffold member 40Y, and both may be arranged adjacent to each other without any gap in the axial direction A (see FIG. 12). ).

(3) In the above embodiment, the configuration in which the main body portion 41 and the extending portion 49 constituting the scaffold member 40 are connected so as to be orthogonal to each other in a side view has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the angle formed by the main body portion 41 and the extending portion 49 may be set to an acute angle or an obtuse angle. Further, the shaft member 30 may be provided on the main body portion 41 without having the extending portion 49. In this case, the shaft member 30 is provided in the main body portion 41 at a position in the vertical direction V and at the same height as the supporting horizontal rail 84A.

(4) In the above-described embodiment, the protrusion 45 is configured to include the horizontal strut 46 and the reinforcing plate 47, and the lower surface of the second portion 47 b of the reinforcing plate 47 is slightly perpendicular to the lower surface of the horizontal strut 46. The configuration located below the direction V has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the positional relationship between the two may be set so that the lower surface of the horizontal column 46 and the lower surface of the second portion 47b of the reinforcing plate 47 are flush with each other. In this case, in addition to the lower surface of the second portion 47b of the reinforcing plate 47, the lower surface of the horizontal strut 46 also becomes the first supported surface 40b. Further, the projecting portion 45 may be configured by only one of the horizontal strut 46 and the reinforcing plate 47.

(5) In the above-described embodiment, the configuration in which the contact support portion 21 is configured to support the scaffold member 40 by contacting the scaffold member 40 in the deployed posture from below is described as an example. However, the embodiment of the present invention is not limited to this. As long as the abutting support member 21 abuts against the scaffold member 40 from above, the abutment support portion 21 may abut on the scaffold member 40 from above as long as the abutting support member 21 abuts against the scaffold member 40 in the deployed posture.

(6) In the above embodiment, the example in which the contact support portion 21 is configured by the upper end portion of the connecting member 20 has been described. However, the embodiment of the present invention is not limited to this. For example, a dedicated contact support member that supports the scaffold member 40 by contacting the protruding portion 45 from a direction opposite to the deployment direction R <b> 1 may be fixed to the connecting member 20. In this case, the abutting support members are respectively connected from the pair of connecting members 20 such that the upper surface abuts on the lower surface (second supported surface 40c in the above embodiment) of the body portion 41 of the scaffold member 40 in the deployed posture. It is preferable to be provided so as to extend inward in the axial direction A.

(7) In the above embodiment, the configuration in which the contact support portion 21 is provided on the connecting member 20 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the connection member 20 may be configured not to include such a contact support portion 21. In this case, in the use state, the scaffold member 40 is supported only by the supporting horizontal rail 84A. Even in such a configuration, the size of the scaffold member 40 is hardly restricted by the relationship with the upper adjacent horizontal crosspiece 84C. Therefore, it is possible to improve the stability of the worker M by securing a wide mounting space S on the scaffold member 40 with a simple configuration in which the scaffold member 40 is formed to be large within an allowable range. In this case, it is advisable to reinforce the strength of the supporting cross beam 84A as necessary.

(8) In the above embodiment, the support crosspiece 84A is in an unused state in which the contact support portion 21 and the protruding portion 45 are in contact and the worker M is not placed on the scaffold member 40 in the deployed posture. The configuration in which the minute gap G is formed between the main body 41 and the main body 41 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, in the unused state, without such a small gap G being formed, the contact support portion 21 and the protruding portion 45 are in contact with each other, and at the same time, the support crosspiece 84A and the main body portion 41 are in contact with each other. It is also good. Note that the support crosspiece 84A and the main body 41 come into contact with each other before the contact support portion 21 and the protrusion 45 contact each other, and in this state, there is a minute gap between the contact support portion 21 and the protrusion 45. A configuration may be adopted in which G is formed.

(9) In the above embodiment, the ladder scaffold 1 has the engagement convex portion 51 (ball plunger) and the engagement concave portion 52 that are engaged with each other, and the scaffold is in relation to a predetermined reference value. The configuration including the posture change regulation mechanism 50 that regulates the posture change of the member 40 has been described. However, the embodiment of the present invention is not limited to this. The ladder scaffold 1 may include a posture change prohibiting mechanism having a locking member such as a hook and a locked member such as a ring that engages with the locking member. The posture change prohibiting mechanism prohibits the posture change of the scaffold member 40 in a state where the locking member and the locked member are engaged, and the operator M manually sets the locking member and the locked member. By releasing the engagement, a mechanism that allows the posture change of the scaffold member 40 can be obtained.

(10) In the above embodiment, the shaft member 30 is fixed between the pair of connecting members 20, and the through hole of the extension portion 49 and the outer peripheral surface of the shaft member 30 are slidable. Described as an example. However, the embodiment of the present invention is not limited to this. It is sufficient that at least the connecting member 20 and the scaffold member 40 are connected to each other via the shaft member 30 so as to be relatively rotatable. For example, the shaft member 30 may be fixed to the extending portion 49 and the through hole of the connecting member 20 and the outer peripheral surface of the shaft member 30 may be slidable.

(11) In the above embodiment, the fixing member 86 for fixing the column 72 and the ladder 8 of the article transporting device 7 and the connecting member 20 for connecting the ladder 8 and the scaffold member 40 are separate members. An example configured as described above. However, the embodiment of the present invention is not limited to this. That is, you may comprise these with a common member. You may comprise so that the ladder 8 may be fixed to the support | pillar 72 via the connection member 20 in the position where the ladder scaffold 1 is installed.

(12) In the article conveyance device 7 including the ladder scaffold 1 described in the above embodiment, the control unit 78 may be provided with an interlock function that prohibits the operation of the article conveyance device 7 under a predetermined condition. In this case, for example, the article conveying device 7 or the ladder 8 is provided with a position detecting means (position sensor) that has a light emitting portion and a light receiving portion such as a laser beam and detects the position of the main body portion 41 of the scaffold member 40. . And it is suitable if the control part 78 is set as the structure which determines the availability of the operation | movement of the article conveyance apparatus 7 according to the attitude | position of the scaffold member 40 estimated based on the detection result by a position detection means. Specifically, for example, the control unit 78 may be configured to prohibit the operation of the article transport device 7 when the estimated posture of the scaffold member 40 is the deployed posture and permit the operation only when the estimated posture is the storage posture. it can.

(13) In the above-described embodiment, the example in which the ladder 8 provided in the article conveyance device 7 is the installation target of the ladder scaffold 1 has been described. However, the embodiment of the present invention is not limited to this. For example, a ladder 8 provided in stationary equipment such as a storage shelf 76 or various buildings can also be included in the installation targets of the ladder scaffold 1. Similarly, a portable ladder 8 that is not fixed to a specific facility can be included in the installation target of the ladder scaffold 1.

(14) Regarding other configurations as well, the embodiments disclosed herein are illustrative in all respects, and embodiments of the present invention are not limited thereto. In other words, configurations that are not described in the claims of the present application can be modified as appropriate without departing from the object of the present invention.

1: Ladder scaffold 7: Article conveying device 8: Ladder 20: Connecting member 21: Abutting support part 30: Shaft member 40: Scaffolding member 40a: Foot scene 40c: Supported surface 41: Body part 45: Protrusion part 49: Extension part 50: Posture change regulation mechanism 71: Traveling carriage 72: Support column 73: Lifting table 81: Vertical beam 84: Horizontal beam G: Minute gap A: Axial direction R1: Deployment direction M: Worker

Claims (4)

A ladder scaffold installed on a ladder having a plurality of horizontal rails spanned between a pair of vertical rails,
A pair of connecting members respectively fixed to the pair of vertical bars;
A shaft member supported by the pair of connecting members in parallel with the horizontal rail,
A scaffold member provided with a foot scene that is a surface on which an operator is placed;
The side on which the worker in the ladder ascends and descends is the front side, the opposite side is the back side,
The scaffold member is stored in a state where the foot scene is positioned on the back side with respect to the ladder in a side view as viewed from an axial direction parallel to the shaft member by rotating about the shaft member as a rotation axis. The posture can be changed between the posture and the deployed posture where the foot scene projects to the front side with respect to the ladder,
In a use state where an operator is placed on the scaffold member in the unfolded posture, the supported surface of the scaffold member on the opposite side to the foot scene is configured to come into contact with the horizontal rail ,
The scaffold member includes a main body portion on which the foot scene is formed, and an extending portion that extends downward from a portion on the back side of the vertical rail in the main body portion in the deployed posture,
A ladder scaffold , wherein the shaft member is connected to the extension portion below the horizontal rail that contacts the supported surface in the use state . A ladder scaffold installed on a ladder having a plurality of horizontal rails spanned between a pair of vertical rails,
A pair of connecting members respectively fixed to the pair of vertical bars;
A shaft member supported by the pair of connecting members in parallel with the horizontal rail,
A scaffold member provided with a foot scene that is a surface on which an operator is placed;
The side on which the worker in the ladder ascends and descends is the front side, the opposite side is the back side,
The scaffold member is stored in a state where the foot scene is positioned on the back side with respect to the ladder in a side view as viewed from an axial direction parallel to the shaft member by rotating about the shaft member as a rotation axis. The posture can be changed between the posture and the deployed posture where the foot scene projects to the front side with respect to the ladder,
In a use state where an operator is placed on the scaffold member in the unfolded posture, the supported surface of the scaffold member on the opposite side to the foot scene is configured to come into contact with the horizontal rail,
The rotation direction of the scaffold member when changing the posture from the stowed posture to the deployed posture is the deployed direction,
The connecting member, wherein the said expanded direction with respect to the scaffold members expand posture have a contact supporting portion supporting the scaffold member abuts the opposite direction,
The scaffold member forms a minute gap between the horizontal beam and the supported surface in contact with the supported surface in the use state when an operator is not placed on the foot scene in the deployed posture. A ladder scaffolding that is structured as follows . A ladder scaffold installed on a ladder having a plurality of horizontal rails spanned between a pair of vertical rails,
A pair of connecting members respectively fixed to the pair of vertical bars;
A shaft member supported by the pair of connecting members in parallel with the horizontal rail,
A scaffold member provided with a foot scene that is a surface on which an operator is placed;
The side on which the worker in the ladder ascends and descends is the front side, the opposite side is the back side,
The scaffold member is stored in a state where the foot scene is positioned on the back side with respect to the ladder in a side view as viewed from an axial direction parallel to the shaft member by rotating about the shaft member as a rotation axis. The posture can be changed between the posture and the deployed posture where the foot scene projects to the front side with respect to the ladder,
In a use state where an operator is placed on the scaffold member in the unfolded posture, the supported surface of the scaffold member on the opposite side to the foot scene is configured to come into contact with the horizontal rail,
The rotation direction of the scaffold member when changing the posture from the stowed posture to the deployed posture is the deployed direction,
The connecting member has an abutment support portion that abuts the scaffold member in the deployed posture from a direction opposite to the deployment direction to support the scaffold member;
The scaffold member has a main body portion on which the foot scene is formed, and a protruding portion that protrudes outward from the main body portion along the axial direction,
The pair of connecting members are formed in a plate shape parallel to the vertical rail,
The shaft member is provided at a position on the back side of the vertical rail,
The protruding portion is provided between the vertical beam and the shaft member in a direction from the front side to the back side,
The plate-like connecting member is a ladder scaffold configured such that the upper end portion thereof is used as the abutting support portion and abuts on the protruding portion of the scaffold member . The ladder is fixed to the support column of the article transporting apparatus including a traveling vehicle that travels along a traveling route and a lifting platform that moves up and down along a support column installed on the traveling vehicle.
The ladder according to any one of claims 1 to 3, further comprising a posture change regulation mechanism that regulates a posture change of the scaffold member in a state where a rotational load less than a predetermined reference value is applied to the scaffold member. Scaffolding.

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