JP7004550B2 - Variable angle ladder for temporary scaffolding - Google Patents

Description

The present invention relates to a ladder for temporary scaffolding constructed at a work site such as construction or civil engineering, and more particularly to a variable angle ladder for temporary scaffolding capable of changing the inclination angle when arranging the temporary scaffolding.

A ladder for workers to move up and down is placed on a temporary scaffold constructed at a work site such as construction or civil engineering. One of these ladders is shown in Patent Document 1 below, and this ladder is placed on the temporary scaffold. It is an angle variable ladder that can change the height at which it can be raised and lowered by changing the tilt angle when doing so.

The variable angle ladder of Patent Document 1 is a ladder in which a plurality of treads are arranged side by side at intervals in the ascending / descending direction between a pair of sasara girders, which are arranged at an angle on a temporary scaffold. Two sets of girders are provided on the upper and lower sides, and a parallel link mechanism is configured by connecting a plurality of treads to the sasara girders in these sets so as to be rotatably connected at two places separated in the front-rear direction of these treads. It has become. For this reason, by causing the two sets of upper and lower sasara girders to shift in the sasara girder length direction, the tilt angle when arranging this variable angle ladder on the temporary scaffolding is changed to increase the height that can be raised and lowered. It can be changed and each footboard can be horizontal or substantially horizontal at each tilt angle.

Further, in the variable angle ladder of Patent Document 1, in order to maintain a constant inclination angle when placed on the temporary scaffolding, the length of the sasara girder for the upper and lower two sets of the sasara girder is placed on the upper part of the sasara girder. A stop means is provided to stop the shift movement in the direction. This stop means is connected to one of the upper and lower sasara girders, which is a plate-shaped member having a curved elongated hole, a male screw member having a male screw, and a male screw. It is configured to include a nut that is a female thread member on which a matching female thread is formed. Of the male thread member and the female thread member, the male thread member is inserted into a curved elongated hole, and the male thread member is attached to the nut. The nut is connected to the other sasara girder of the upper and lower two sets of sasara girders, and a plurality of male screw members are formed in a curved elongated hole in a stepped manner. After fitting into one of the recessed portions, the plate-shaped member is sandwiched between the male screw member and the nut by rotating the male screw member, so that the upper and lower two sets of sasara girders can be moved in the sasara girder length direction. The slip movement can be stopped.

Japanese Unexamined Patent Publication No. 11-107520

In the variable angle ladder of Patent Document 1, when the male screw member which is the rotation operation member is rotated with respect to the nut which is the female screw member, the nut does not rotate together with the male screw member. , This nut is fixed and attached to the other sasara girder described above by welding or the like.

An object of the present invention is that even if a screw member that is a rotation operation member is rotated, the screw member to which the screw member is screwed rotates together even if the screw member is not fixed to the scaffolding girder by welding or the like. It is in place to provide a variable angle ladder for temporary scaffolding that will be able to prevent.

The variable angle ladder for temporary scaffolding according to the present invention is a ladder in which a plurality of tread plates are arranged side by side at intervals in the vertical direction between a pair of sasara girders. Two sets of the pair of sasara girders are provided on the upper and lower sides, and the plurality of tread plates are rotatably connected to the sasara girders in these sets at two positions separated from each other in the front-rear direction. A mechanism is configured, and a stop means for stopping the displacement movement of the upper and lower two sets of sasara girders in the length direction of the sasara girder is provided on the upper part of the sasara girder, and the stop means is provided for the upper and lower two sets of the sasara girders. Of the sasara girders, a plate-shaped member that is connected to one of the sasara girders and has a curved elongated hole, a male screw member that has a male screw, and a female screw that has a female screw that is screwed into the male screw. It is configured to include a member, one of the male screw member and the female screw member is inserted into the curved elongated hole, and either the male screw member or the female screw member is the remaining screw member. The remaining screw member is connected to the other sasara girder of the upper and lower two sets of sasara girders, and is said to be rotated by the rotation operation of the rotation operation member. In the temporary scaffolding angle variable ladder in which the male screw member and the female screw member sandwich the plate-shaped member and the displacement movement of the upper and lower two sets of sasara girders in the sasara girder length direction is stopped, the rotation operation member is The male screw member and the female screw member are the other screw members, and the one screw member inserted into the curved elongated hole is provided with a detent portion and has the curved shape. The elongated hole is provided with an engaging portion with which the detent portion engages, and a plurality of engaging portions are provided in the length direction of the curved elongated hole. Is.

In this variable angle ladder for temporary scaffolding, one of the male-threaded member and the female-threaded member, which is inserted into the curved elongated hole, is provided with a detent portion, and the curved elongated hole is provided with a detent portion. Since the engaging portion with which the detent portion engages is provided, even if the other screw member, which is the rotation operation member to be rotationally operated, among the male screw member and the female screw member is rotationally operated, this The one-sided screw member to which the screw member is screwed is prevented from rotating together by the detent portion engaged with the engaging portion. Therefore, in order to connect the remaining screw member, in other words, the one screw member, to the other sasara girder of the upper and lower two sets of sasara girders, one screw member is attached to the sasara girder. The work of fixing by welding or the like becomes unnecessary, and therefore, the structure and work for connecting the one screw member to the other sasara girder can be simplified.

Further, since a plurality of engaging portions with which the detent portions provided on one of the screw members are engaged are provided in the length direction of the curved elongated holes, the upper and lower two sets of sasara girders are provided with sasara. Even if the work of adjusting the tilt angle of the variable angle ladder when installing it on a temporary scaffold by causing a shift movement in the girder length direction is performed, it is possible to prevent the above-mentioned co-rotation at each tilt angle. can.

In the above invention, the detent portion provided in the one screw member inserted into the curved elongated hole and the engaging portion provided in the curved elongated hole are engaged with the detent portion. By doing so, among the male screw member and the female screw member, even if the screw member becomes a rotation operation member to be rotated and the screw member is rotated, the screw member to which the screw member is screwed does not rotate together. , An example thereof is that the detent portion is a protruding portion protruding in the outer radial direction of the one screw member, and the engaging portion is in the width direction of a curved elongated hole. It is to make a dented part that is dented to the outside.

Further, in the case where the detent portion is a protruding portion protruding in the outer radial direction of one of the screw members and the engaging portion is a recessed portion recessed outward in the width direction of the curved elongated hole. A quadrangular portion having a quadrangular cross-sectional shape orthogonal to the axial direction of the threaded member may be provided on the one screw member, and the four corner portions of the quadrangular portion may be used as the protruding portion.

Further, in order to connect the screw member that is prevented from rotating together even if the rotation operation member is rotated, in other words, the one screw member to the other sasara girder described above, for example, to the other sasara girder. By connecting a connecting member provided with a round hole for inserting the one screw member and inserting the one screw member into the round hole of the connecting member, the one screw member is inserted into the other screw member described above. The structure may be connected to the sasara girder, and in such a case, one screw member and the other screw member, which are the male screw member and the female screw member described above, are formed into the plate shape by the rotation operation of the rotation operation member. The member and the connecting member will be sandwiched.

Then, in order for one screw member and the other screw member to sandwich the plate-shaped member and the connecting member in this way, a head is provided at the axial end of one screw member, and the head rotates. By rotating the operating member to contact one of the plate-shaped member and the connecting member, one screw member and the other screw member, which are the male-threaded member and the female-threaded member described above, form the plate-shaped member and the connecting member. It may be sandwiched.

In the present invention described above, the one screw member and the remaining screw member may be the male screw member, and the other screw member which is the rotation operation member may be the female screw member, or the one screw. The member and the remaining screw member may be the female screw member, and the other screw member which is the rotation operation member may be the male screw member.

Further, the plate-shaped member in which the above-mentioned curved elongated hole is formed may have a planar shape, or may be bent at an angle from the main body portion in which the curved elongated hole is formed. It may be provided with a reinforcing portion. According to the latter, the main body portion in which the curved elongated hole is formed is reinforced by the reinforcing portion, and the deformation of the curved elongated hole can be prevented, whereby the one screw member is the rotation operating member. In order to prevent co-rotation when the rotation operation is performed, it is possible to more reliably engage the detent portion of the one screw member with the engaging portion provided in the curved elongated hole. It will be like.

According to the present invention, even if a screw member that is a rotation operation member is rotated, the screw member to which the screw member is screwed rotates together even if it is not fixed to the sasara girder by welding or the like. It can be prevented, which has the effect of simplifying the structure.

FIG. 1 is a perspective view showing the entire temporary scaffolding angle variable ladder according to an embodiment of the present invention. FIG. 2 is a side view of the angle variable ladder for the temporary scaffold of FIG. 1. FIG. 3 is a plan view of the angle variable ladder for temporary scaffolding of FIGS. 1 and 2. FIG. 4 is a partially enlarged view of FIG. 2 showing a stop means provided on the upper part of the sasara girder. FIG. 5 is a perspective view of the stop means, and is a diagram showing the male screw member and the female screw member, which are constituent members of the stop means, separately. 6A and 6B show a plate-shaped member which is a constituent member of the stop means, FIG. 6A is a front view, and FIG. 6B is a side view. FIG. 7 is a diagram showing that the male screw member is prevented from rotating together and inserted into the curved elongated hole of the plate-shaped member. FIG. 8 is a cross-sectional view showing the relationship between the plate-shaped member, the male-screw member, and the female-screw member when the male-screw member is prevented from rotating together and inserted into the curved elongated hole. FIG. 9 is a side view showing a case where the variable angle ladder for the temporary scaffold is arranged on the temporary scaffold with a large inclination angle. FIG. 10 is a side view showing a case where the variable angle ladder for temporary scaffolding is arranged on the temporary scaffolding with a small inclination angle. FIG. 11 is a diagram similar to FIG. 8 showing the stop means according to another embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows an overall perspective view of an angle-variable ladder 1 for a temporary scaffold according to an embodiment of the present invention, FIG. 2 is a side view of the angle-variable ladder 1, and FIG. 3 is a side view of the angle-variable ladder 1. It is a top view of the ladder 1. In the variable angle ladder 1, a plurality of treads 3 are arranged side by side between a pair of sasara girders 2 at intervals in the ascending / descending direction, and two sets of upper and lower sasara girders 2 are provided. Therefore, the variable angle ladder 1 is configured to include an upper sasara girder 2A and a lower sasara girder 2B as a pair of sasara girders 2.

Each tread 3 is bridged between the upper sasara girder 2A and the lower sasara girder 2B, and the front side surface of these tread plates 3 is connected to the lower sasara girder 2B by a pin 4 and the side surface. The rear portion is connected to the upper sasara girder 2A by a pin 5. Further, the leg seat member 6 is arranged at the lower end portion of the upper sasara girder 2A and the lower end portion of the lower sasara girder 2B, and the side surface of the leg seat member 6 provided for each of the pair of sasara girders 2. The front portion is connected to the lower sasara girder 2B by a pin 7, and the side rear portion is connected to the upper sasara girder 2A by a pin 8. Therefore, the tread 3 is rotatable with respect to the sasara girders 2A and 2B centering on the pins 4 and 5, and the leg seat member 6 is also rotatable with respect to the sasara girders 2A and 2B centering on the pins 7 and 8. It is rotatable. The distance between the pin 4 and the pin 5 is the same as the distance between the pin 7 and the pin 8.

As described above, each of the treads 3 is connected to the sasara girders 2A and 2B by pins 4 and 5 at two locations separated from each other in the front-rear direction of the treads 3, and the leg seat member 6 is also connected to the front and rear of the leg member 6. Since it is connected to the sasara girders 2A and 2B by the pins 7 and 8 at two points separated in the direction, the upper sasara girder 2A, the lower sasara girder 2B, the tread plate 3 and the leg seat member 6 are used to connect the upper sasara girder 2A and 2B. A parallel link mechanism is configured in which the girder 2A and the lower sasara girder 2B form a long side portion. Therefore, the pair of upper and lower sasara girders 2A and 2B can be displaced in the length direction of the sasara girder 2, and this displacement movement is among the pair of upper and lower sasara girders 2A and 2B. , A pair of sasara girders in one set is rotated with respect to a pair of sasara girders in the other set with the distance between the pin 4 and the pin 5 as the radius.

The pins 4, 5, 7, and 8 in the present embodiment are bolts and nuts among the bolts and nuts that are fasteners for fastening the tread 3 and the leg seat member 6 to the sasara girders 2A and 2B. It depends on the shaft.

FIG. 4 shows the structure of the upper part of the upper sasara girders 2A and 2B among the total lengths of the upper sasara girder 2A and the lower sasara girder 2B. A hook member 9 is provided on the upper portion of the lower sasara girder 2B, and the hook member 9 provided on each of the pair of lower sasara girders 2B is a coupling tool 10 using bolts and nuts on the sasara girder 2B. The hook is composed of a bonded base portion 9A and a hook portion 9B formed at a position beyond the upper end of the lower sasara girder 2B at the tip of the base portion 9A extending linearly along the sasara girder 2B. The portion 9B is provided with an opening 9C that is open downward. These hook members 9 are for locking the upper portion of the lower sasara girder 2B to the horizontal member 15 which is a constituent member of the temporary scaffolding 11 shown in FIGS. 9 and 10. The temporary scaffolding 11 shown in FIGS. 9 and 10 has a plurality of columns 13 each erected on the jack base 12, and a plurality of horizontal members 15 each connected to the columns 13 by a clamp 14 and each other. It is constructed by being bridged by two horizontal members 15 arranged so as to face each other in the horizontal direction, and including a work cloth plate 16 for an operator to ride on and perform walking, work, and the like. The opening 9C of the hook portion 9B is fitted to one of the two horizontal members 15 over which the work cloth plate 16 is laid from above, so that the opening portion 9C is lowered to the horizontal member 15. The hook member 9 of the side ladder girder 2B is locked, and by this locking, the scaffold member 6 is mounted on the ground 17 of the work site where the jack base 12 is mounted, and the angle according to the present embodiment. The variable ladder 1 is inclined and arranged on the temporary scaffolding 11.

The variable angle ladder 1 according to the present embodiment is tilted inside the temporary scaffold by placing the leg seat member 6 on a floor formed at a height position such as the middle stage of the temporary scaffold. Can also be placed.

Further, as shown in FIG. 4, the hook member 9 of the angle variable ladder 1 according to the present embodiment is a member for preventing the horizontal member 15 from coming out from the opening 9C of the hook portion 9B. The lock member 18 is arranged. The lock member 18 is formed with two elongated holes 21 and 22 in which two pins 19 and 20 fixed to the hook member 9 are idle, and an opening of the hook portion 9B is formed. After the 9C is fitted to the horizontal member 15 from above, the lock member 18 is rotated while being idled by the elongated holes 21 and 22, and a part of the lower side of the opening 9C is closed by the lock member 18. , The horizontal member 15 is prevented from coming out from the opening 9C of the hook portion 9B.

Further, the handrail 23 shown in FIGS. 9 and 10 can be attached to the variable angle ladder 1 according to the present embodiment. That is, the handrail 23 has two strut portions 23A and a connecting portion 23B for connecting the upper end portions of these strut portions 23A, and the angle variable ladder 1 according to the present embodiment includes a variable angle ladder 1. On the outer surface of the pair of upper ladder girders 2A, two box-shaped holding portions 24 for inserting and holding the lower portions of the two strut portions 23A are provided and inserted into the holding portions 24. The handrail 23 is attached to the variable angle ladder 1 by tightening and holding the lower portion of the supported column portion 23A to the holding portion 24 by a fastener such as a set screw.

As described above, the pair of upper and lower pair of scaffolding girders 2A and 2B can be displaced in the length direction of the sasara girder 2, and this displacement movement is as shown in FIGS. 9 and 10. In addition, after the amount required for the variable angle ladder 1 tilted on the temporary scaffolding 11 is generated, this displacement movement is stopped to stop the tilting angle of the variable angle ladder 1 with respect to the temporary scaffolding 11 to be constant. As shown in FIG. 4, the means 30 is provided on the upper part of the upper side ladder girder 2A and the lower side side ladder girder 2B. As shown in FIG. 3, the stop means 30 is provided for each of the two sasara girders 2 for forming a pair, similarly to the leg seat member 6.

As shown in FIG. 5, the stop means 30 includes a plate-shaped member 31 coupled to the lower sasara girder 2B, a connecting member 32 coupled to the upper sasara girder 2A, and a male screw member 33. It is configured to include a female screw member 34. FIG. 6 shows a plate-shaped member 31, FIG. 6A is a front view, and FIG. 6B is a side view. As can be seen from these figures, the plate-shaped member 31 is formed by punching and bending a sheet metal, and is bent at an angle of 90 degrees from the main body portion 31A and the front end of the main body portion 31A. It has a reinforcing portion 31B. In the lower part of the main body portion 31A, a plurality of holes 31C for inserting the shaft portion of the bolt of the fitting 10 by the above-mentioned bolt and nut for connecting the hook member 9 to the lower sasara girder 2B are formed. The plate-shaped member 31 is fastened together with the hook member 9 to the lower sasara girder 2B by the coupling tool 10 through these holes 31C.

Further, as shown in FIG. 5, the connecting member 32 is a plate-shaped member extending linearly in the length direction of the upper sasara girder 2A, and the base thereof is attached to the upper sasara girder 2A by bolts and nuts. A round hole 36 is provided at the tip of the connecting member 32 connected by the coupling tool 35. The male screw member 33 is composed of a head 33A and a shaft portion 33C extending axially from the head 33A via a quadrangular portion 33B having a thickness in the axial direction of the male screw member 33. A male screw 37 is engraved on the outer peripheral surface. The quadrangular portion 33B has a regular quadrangular cross-sectional shape orthogonal to the axial direction of the male screw member 33, and the four corner portions 38 of the quadrangular portion 33B project in the outer diameter direction of the male screw member 33. It is a protruding portion of the male screw member 33. As described above, since the male screw member 33 is provided with a quadrangular portion 33B having a thickness in the axial direction of the male screw member 33 between the head portion 33A and the shaft portion 33C, the male screw member 33 is a corner. It is a root bolt.

The female screw member 34 is a screw member screwed into the male screw member 33, and is also a rotation operation member having a rotation operation unit 34A that is rotationally operated by an operator. FIG. 8 shows the female screw member 34 when it is screwed into the male screw member 33, and as can be seen from FIG. 8, the female screw member 34 has a cylindrical portion protruding from the large-diameter rotation operation unit 34A. A 34B is provided, and a female screw 39 to be screwed into the male screw 37 of the male screw member 33 is engraved on the inner peripheral surface inside the tubular portion 34B. In the present embodiment, the bottomed tubular member 40 is inserted and fixed inside the tubular portion 34B, and the bottomed tubular member 40 is engraved with a female screw 39 on the inner peripheral surface.

As shown in FIGS. 5 and 6B, a curved elongated hole 41 is formed in the main body portion 31A of the plate-shaped member 31, and the curved elongated hole 41 is shown in FIG. Is also shown. As shown in FIG. 8, after the shaft portion 33C of the male screw member 33 is inserted into the curved elongated hole 41, the rectangular portion 33B of the male screw member 33 is inserted into the curved elongated hole 41, and then The shaft portion 33C of the male screw member 33 is inserted into the round hole 36 provided at the tip end portion of the connecting member 32 also shown in FIG. When the female screw 39 of the female screw member 34 is screwed into the male screw 37 of the shaft portion 33C protruding from the round hole 36 and the female screw member 34 is advanced with respect to the male screw member 33 by the rotation operation of the rotation operation unit 34A, the male screw member 33 The head 33A and the tip of the tubular portion 34B of the female screw member 34 sandwich the main body portion 31A of the plate-shaped member 31 and the connecting member 32 as shown in FIG. At this time, the head 33A of the male screw member 33 is in contact with the main body portion 31A of the plate-shaped member 31.

The curved elongated hole 41 provided in the main body portion 31A of the plate-shaped member 31 is an elongated hole curved with a constant radius of curvature, and the radius of curvature is shown in FIG. 2, respectively. The round hole 36 of the connecting member 32 draws when the upper sasara girder 2A rotates and shifts with respect to the lower sasara girder 2B by rotating the tread plate 3 around the pin 4. It is the same as the radius of curvature of the arc locus.

As shown in FIG. 6B, the curved elongated hole 41 is provided with a recessed portion 41A recessed outward in the width direction on both sides of the elongated hole 41 in the width direction, and the recessed portion 41A is provided. Are provided in a plurality in the length direction of the curved elongated holes 41. Each recessed portion 41A has a shape corresponding to the above-mentioned corner portion 38 of the square portion 33B of the male screw member 33, and therefore, these recessed portions 41A have an opening angle of 90 degrees V. It is in the shape of a letter. Further, as shown in FIG. 7, the positional relationship of the recessed portions 41A provided on both sides of the elongated hole 41 in the width direction is one of the four corner portions 38 provided in the quadrangular portion 33B. When the corner portion 38 of the hole 41 is inserted into and engaged with the recess portion 41A provided on one side of both sides of the elongated hole 41 in the width direction, another corner portion 38 diagonal to the corner portion 38 is inserted. However, there is a positional relationship in which the elongated hole 41 is inserted and engaged with the recessed portion 41A provided on the other side of both sides in the width direction. Further, both ends of the curved elongated hole 41 in the length direction are end portions 41B having an opening angle of 90 degrees at which the corner portions 38 can be inserted and engaged, similar to the recessed portions 41A.

FIG. 8 shows a state in which the corner portion 38 of the quadrangular portion 33B of the male screw member 33 is inserted and engaged with the recessed portion 41A of the curved elongated hole 41.

Since the stop means 30 composed of the plate-shaped member 31, the male screw member 33, the female screw member 34, etc. is configured as described above, as shown in FIG. 8, the plate-shaped member together with the male screw member 33 The female screw member 34 sandwiching the connecting member 32 with the 31 is retracted from the male screw member 33 by the reverse rotation operation of the rotation operation unit 34A, and then the female screw member 34 and the male screw member 33 are retracted from the male screw member 33 by the reverse rotation operation of the rotation operation unit 34A. By moving in the direction, the corner portion 38 of the square portion 33B of the male screw member 33 is pulled out from the recessed portion 41A of the curved elongated hole 41, and the shaft portion 33C of the male screw member 33 coincides with the position of the curved elongated hole 41. After the upper sasara girder 2A is rotated and moved with respect to the lower sasara girder 2B, the female screw member 34 and the male screw member 33 screwed to the female screw member 34 are screwed together. By moving the shaft portion 33C of the member 33 inside the curved elongated hole 41, the shaft portion 33C can be moved with respect to the curved elongated hole 41. After that, by moving the female screw member 34 and the male screw member 33 in the axial direction of the screw members 33, 34, the corner portion 38 of the quadrangular portion 33B of the male screw member 33 is formed into the curved elongated hole 41. It can be inserted and engaged with the recessed portion 41A different from the recessed portion 41A described above, and then the rotation operation portion 34A of the female screw member 34 is operated in the forward rotation, as shown in FIG. 8, again. The plate-shaped member 31 and the connecting member 32 can be sandwiched between the female screw member 34 and the male screw member 33.

As a result, the shift movement of the pair of upper and lower sasara girders 2A and 2B constituting the parallel link mechanism described above in the sasara girder length direction is stopped by the stop means 30, and the pair of these pairs. The sasara girders 2A and 2B are maintained in a predetermined positional relationship.

As described above, when the female screw member 34 is rotated in the forward direction or in the reverse direction by the rotation operation of the rotation operation unit 34A, the rotation of the female screw member 34 is transmitted to the male screw member 33. An angle that is inserted and engaged with the recessed portion 41A of the curved elongated hole 41 formed in the plate-shaped member 31 connected to the lower sasara girder 2B, although the male screw member 33 tries to rotate. Since the square portion 33B provided with the portion 38 is provided, the male screw member 33 rotates integrally with the female screw member 34 in the corner portion 38 which is a protruding portion protruding in the outer radial direction of the male screw member 33. The recessed portion 41A provided in the curved elongated hole 41 and inserted and engaged with the corner portion 38 serves as a detent portion of the male screw member 33 for preventing the rotation, and the recessed portion 41A in which the corner portion 38 is inserted and engaged is the curved elongated hole 41. It becomes an engaging portion and cooperates with the above-mentioned detent portion to prevent the male screw member 33 from rotating integrally with the female screw member 34.

As described above, the amount of shifting the pair of upper and lower pair of scaffolding girders 2A and 2B in the direction of the length of the scaffolding girder is, as shown in FIGS. 9 and 10, the variable angle ladder according to the present embodiment. The amount of 1 is set according to the inclination angle of the variable angle ladder 1 when the temporary scaffold 11 is arranged. As shown in FIG. 9, when the inclination angle is large, the amount of displacement is increased as compared with the case where the upper and lower two sets of sasara girders 2A and 2B are in the contact state or the substantially contact state. , As shown in FIG. 10, when this inclination angle is small, the amount of displacement movement is reduced. In any of these cases, the above-mentioned displacement amount is generated until the respective tread plate 3 and the leg seat member 6 are horizontal or substantially horizontal so as to be parallel to or substantially parallel to the ground 17 at the work site.

According to the present embodiment described above, the male screw member 33 to which the rotation of the female screw member 34, which is the rotation operation member, is transmitted is formed on the plate-shaped member 31 coupled to the lower sasara girder 2B. Since the quadrangular portion 33B provided with the corner portion 38 that can be inserted and engaged is provided in the recessed portion 41A of the curved elongated hole 41, it is a protruding portion that protrudes in the outer radial direction of the male screw member 33. The corner portion 38 is inserted into and engaged with the recessed portion 41A provided as the engaging portion in the curved elongated hole 41 to prevent the male screw member 33 from rotating integrally with the female screw member 34. It is a detent portion of the male screw member 33 for this purpose. Therefore, it is not necessary to fix the male screw member 33 to the upper side of the sasara girder 2A by welding or the like, and in order to connect the male screw member 33 to the upper side of the sasara girder 2A, the connecting member 32 provided on the sasara girder 2A Since the shaft portion 33C of the male screw member 33 may be simply inserted into the round hole 36, the structure and work for connecting the male screw member 33 to the upper sasara girder 2A can be simplified.

Further, since a plurality of recessed portions 41A of the curved elongated hole 41 according to the present embodiment are provided in the length direction of the elongated hole 41, two pairs of upper and lower sasara girders 2A and 2B are provided as sasara girders. The amount of shift movement in the length direction can be adjusted in multiple stages, and the tilt angle of the angle-variable ladder 1 with respect to the temporary scaffolding 11 can be changed to a large number of angles. Further, since both ends of the curved elongated hole 41 in the length direction are end portions 41B into which the corner portions 38 of the quadrangular portion 33B of the male screw member 33 can be inserted and engaged as described above, the curved shape is curved. By utilizing the total length of the elongated hole 41 of the above, the amount of displacement of the pair of upper and lower sasara girders 2A and 2B in the sasara girder length direction can be adjusted.

Further, after the corner portion 38 of the quadrangular portion 33B of the male screw member 33 is inserted and engaged with the recessed portion 41A of the curved elongated hole 41, even if the tightening of the female screw member 34 to the male screw member 33 may be loosened, the corner may be loosened. By engaging the portion 38 with the recessed portion 41A, it is possible to prevent the male screw member 33 and the female screw member 34 from moving along the curved elongated hole 41.

Further, as described with reference to FIG. 6, the plate-shaped member 31 in which the curved elongated hole 41 is formed has an angle from the main body portion 31A provided with the curved elongated hole 41 and the main body portion 31A. Since it has a reinforcing portion 31B that is bent, even if the curved elongated hole 41 is formed in the plate-shaped member 31, the main body portion 31A provided with the curved elongated hole 41. And the deformation of the curved elongated hole 41 can be prevented by the reinforcing action of the reinforcing portion 31B, whereby the corner of the square portion 33B of the male screw member 33 is formed in the recessed portion 41A and the end portion 41B of the curved elongated hole 41. It is possible to more reliably carry out the insertion engagement of the portion 38.

Further, according to the present embodiment, as can be seen from FIG. 3, a stop means 30 is provided for each of the two sasara girders 2 for forming a pair, and the stop means 30 are rotated. Since the two female screw members 34 provided as operating members are arranged outward in the width direction of the angle variable ladder 1 according to the present embodiment, the operator can easily rotate these female screw members 34. Can be operated.

FIG. 11 shows a stop means 130 according to another embodiment. The stop means 130 is also configured to include a plate-shaped member 131 coupled to the lower sasara girder 2B, a connecting member 132 coupled to the upper sasara girder 2A, a male screw member 133, and a female screw member 134. ing. A curved elongated hole 141 is formed in the plate-shaped member 131, and a plurality of recesses 141A recessed outward in the width direction of the elongated hole 141 are formed on both sides of the elongated hole 141 in the width direction in the length direction of the elongated hole 141. It is provided individually. In the female thread member 134, a quadrangular portion 134B having a regular quadrangular cross-sectional shape orthogonal to the axial direction of the female thread member 134 is integrally formed with the head 134A of the female thread member 134, and the quadrangular portion 134B is formed. Is provided with four corners 138. A bottomed tubular member 140 is inserted and fixed inside the head 134A and the quadrangular portion 134B, and a female screw 139 is engraved on the inner peripheral surface of the bottomed tubular member 140. The male screw member 133 has a rotation operation unit 133A that can be rotated and operated, and a tubular portion 133B that protrudes from the rotation operation unit 133A, and is screwed with the female screw 139 of the female screw member 134 inside the tubular portion 133B. A holding member 143 holding the male screw shaft 142 having the male screw 137 engraved on the outer peripheral surface is inserted and fixed.

The tip of the bottomed tubular member 140 of the female screw member 134 is inserted into the round hole 136 provided in the connecting member 132, and the corner portion 138 of the quadrangular portion 134B of the female screw member 134 is formed into a curved elongated hole 141. After inserting and engaging with the recessed portion 141A of the above, the tip of the male screw shaft 142 of the male screw member 133 is inserted into the bottomed tubular member 140 of the female screw member 134, and the male screw member 133 is operated in the forward rotation of the rotation operation portion 133A. When rotated by, the male screw member 133 advances with respect to the female screw member 134, so that the male screw member 133 and the female screw member 134 sandwich the plate-shaped member 131 and the connecting member 132, as in the above embodiment. The attachment is performed by the head 134A of the female screw member 134 abutting on the plate-shaped member 131.

As can be seen from this embodiment, of the male screw member and the female screw member, the screw member to be rotated may be a male screw member unlike the above embodiment.

INDUSTRIAL APPLICABILITY The present invention can be used for an angle-variable ladder that is arranged by changing the inclination angle on a temporary scaffold constructed at a work site such as construction or civil engineering.

1 Variable angle ladder for temporary scaffolding 2 Sasara girder 2A Upper sasara girder 2B Lower sasara girder 3 Stair tread 11 Temporary scaffolding 30, 130 Stop means 31 131 Plate-shaped member 31A Main body 31B Reinforcing part 32, 132 Connecting member 33, 133 Male thread member 33A Head 33B Square part 34,134 Female thread member 36,136 Round hole 37,137 Male thread 38,138 Corner part 39,139 Female thread 41,141 that is a detent part and also serves as a protruding part. Holes 41A, 141A Recessed part that is an engaging part 134A Head 134B Square part

Claims (10)

It is a ladder that is tilted on a temporary scaffold and has multiple treads arranged side by side at intervals in the ascending / descending direction between a pair of sasara girders.
Two sets of the pair of sasara girders are provided above and below, and the plurality of tread plates are rotatably connected to the sasara girders in these sets at two locations separated in the front-rear direction of the tread plates, whereby a parallel link is provided. A mechanism is configured, and a stop means for stopping the displacement movement of the upper and lower two sets of sasara girders in the sasara girder length direction is provided on the upper part of the sasara girder, and the stop means are provided for the upper and lower two sets of the sasara girders. Of the sasara girders, a plate-shaped member that is connected to one of the sasara girders and has a curved elongated hole, a male screw member that has a male screw, and a female screw that has a female screw that is screwed into the male screw. It is configured to include a member, one of the male screw member and the female screw member is inserted into the curved elongated hole, and either the male screw member or the female screw member is the remaining screw member. The remaining screw member is connected to the other sasara girder of the upper and lower two sets of sasara girders, and is connected to the other sasara girder by the rotation operation of the rotation operation member. In the temporary scaffolding angle variable ladder in which the male screw member and the female screw member sandwich the plate-shaped member and the displacement movement of the upper and lower two sets of sasara girders in the sasara girder length direction is stopped.
The rotation operation member is the other screw member of the male screw member and the female screw member, and the one screw member inserted into the curved elongated hole is provided with a detent portion. At the same time, the curved elongated hole is provided with an engaging portion with which the detent portion engages, and a plurality of engaging portions are provided in the length direction of the curved elongated hole .
The one sasara girder to which the plate-shaped member having the curved elongated hole is formed is provided with a hook member to be locked to the horizontal member constituting the temporary scaffold, and is provided with the plate-shaped member. A variable angle ladder for temporary scaffolding, wherein the hook member is co-fastened to one of the sasara girders by a coupling tool . In the temporary scaffolding angle variable ladder according to claim 1, the plate-shaped member and the hook member are arranged so as to sandwich the one of the sasara girders, and the co-fastening joint by the coupling tool is the same as the plate-shaped member. An angle-variable ladder for temporary scaffolding, wherein the hook member is formed with one of the sasara girders sandwiched between the hook members. The variable angle ladder for temporary scaffolding according to claim 1 or 2, wherein a plurality of the coupling tools are provided in the length direction of one of the sasara girders. In the temporary scaffolding angle variable ladder according to any one of claims 1 to 3, the detent portion is a protruding portion protruding in the outer diameter direction of one of the screw members, and the engaging portion is a protruding portion. An angle-variable ladder for temporary scaffolding, which is a recessed portion that is recessed outward in the width direction of the curved elongated hole. In the temporary scaffolding angle variable ladder according to claim 4 , the one screw member is provided with a quadrangular portion having a rectangular cross-sectional shape orthogonal to the axial direction of the screw member, and the square portion 4 is provided. An angle-variable ladder for temporary scaffolding, characterized in that each corner portion is the protruding portion. In the temporary scaffolding angle variable ladder according to any one of claims 1 to 5 , a connecting member having a round hole into which the one screw member is inserted is connected to the other sasara girder. A variable angle ladder for temporary scaffolding, wherein the male screw member and the female screw member sandwich the plate-shaped member and the connecting member by the rotation operation of the rotation operation member. In the temporary scaffolding angle variable ladder according to claim 6 , a head is provided at the axial end of the one screw member, and the head is formed with the plate-shaped member by the rotation operation of the rotation operation member. A temporary scaffolding angle variable ladder, characterized in that the male screw member and the female screw member sandwich the plate-shaped member and the connecting member by abutting on one of the connecting members. In the temporary scaffolding angle variable ladder according to any one of claims 1 to 7 , the one screw member and the remaining screw member are the male screw members, and the other screw which is the rotation operation member. The member is a temporary scaffolding angle variable ladder characterized by being the female screw member. In the variable angle ladder for temporary scaffolding according to any one of claims 1 to 8 , the plate-shaped member has a reinforcing portion that is bent at an angle from the main body portion in which the curved elongated hole is formed. A variable angle ladder for temporary scaffolding, which is characterized by being provided with. In the temporary scaffolding angle variable ladder according to claim 9, the reinforcing portion has an angle of 90 degrees from the end portion of the main body portion in the length direction of the one sasara girder to the width direction of the one sasara girder. The end portion of the reinforcing portion on the side of the one ladder girder, which is bent and has a length dimension toward the side of the other ladder girder, abuts on the one ladder girder. A variable angle ladder for temporary scaffolding.

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