JPWO2004085766A1 - Support mechanism for preventing lifting of prop - Google Patents

Abstract

In this invention, the support | pillar raising / lowering apparatus 4 is equipped with the groove | channel for a movement by which the support | pillar 3 is loosely fitted inside, and raises / lowers along the support | pillar 3. As shown in FIG. One or a plurality of pairs of guide rollers 6 are provided on both sides of the opening portion of the moving groove. The guide roller 6 is provided with a central protrusion 5a, an upper protrusion 5b, and a lower protrusion 5c extending in a petal shape, and the central protrusion 5a is biased by a spring or the like so as to be in the horizontal direction. When the column raising / lowering device 4 moves up and down along the column 3 and the central projection 5a hits the cross member 2, the central projection 5a of the guide roller 6 rotates upward or downward against the urging force. However, the upper protrusion 5b or the lower protrusion 5c protrudes from the opening of the moving groove as it rotates, so that the locking relationship between the column 3 and the guide roller 6 is maintained. Thus, it is possible to prevent the column lifting device 4 from being detached from the column 3.

Description

In the present invention, the column from the column of the column lifting device that is movable up and down along the column in a state where the column is held in the movement groove opened on the side of the column against the column from which the horizontal member protrudes. The present invention relates to a detachment prevention mechanism for a column lifting device for preventing detachment.
As a specific application target, for example, when a column lifting device for lifting and lowering along a column scaffolding frame assembled vertically and horizontally to support a preceding handrail is prevented from coming off the column scaffolding column. Can be mentioned. However, the present invention is not limited to this, and the present invention can be applied to a general lifting device that moves up and down along a support column from which a cross member branches.

The frame scaffolding used for building construction, repair, and dismantling is a large number of building frames in the left-right direction that have a pair of support columns that can be added in the vertical direction and cross members that connect the upper parts of both support columns. They are installed side by side, and the cloth plates are passed between adjacent building frames and assembled in a plurality of stages in the vertical direction. After completion of the work, they are disassembled sequentially from above.
In such a frame scaffolding, a handrail for preventing a worker from falling is attached or a safety rope is stretched.
However, attaching a large number of handrails to the framework scaffold is not economical from the viewpoint of work and the amount of materials required. In addition, the work of attaching the handrail on the previously assembled scaffold is a work at a high place and is dangerous even with a lifeline attached. Furthermore, when the attachment of the handrail is unstable, the operator may fall down with the handrail.
On the other hand, there is a construction method in which a frame scaffold is added upward using a preceding handrail frame lifted slidably from below.
With regard to such a preceding handrail frame, the applicant has developed a preceding handrail frame for a frame scaffold described in International Publication No. WO97 / 10399. The preceding handrail frame includes a substantially rectangular frame, a first guide provided on the left and right of a substantially central portion in the vertical direction of the frame, and a second guide provided on the left and right of the bottom side of the frame. The frame of the preceding handrail frame is passed between the columns of two building frames adjacent to each other in the left-right direction, and can be slid between the building frames with the first guide and the second guide. It is.
However, in the type in which the preceding handrail frame is slid between adjacent building frames, it is difficult to slide the preceding handrail frame in the vertical direction if the interval between the building frames is slightly narrow. Moreover, when the space | interval between adjacent building frames is too wide, the engagement relationship between the said 1st guide and 2nd guide, and the support | pillar of a building frame cannot be maintained, but there exists a problem that a preceding handrail frame will remove | deviate. .
Therefore, the present applicant does not slide the preceding handrail frame between adjacent building frames as described in Japanese Patent Publication No. 2003-064863, but follows one column of the building frame. We have developed a support device for the leading handrail that can be moved up and down. In that case, the handrail portion is formed by bridging between support devices attached to adjacent building frames, or by connecting handrail frames previously attached to the upper portion of the support device.
The support device for the preceding handrail is, for example, formed by supporting the main body of the support device in a U-shaped cross-section and embracing the pillar of the building frame inside thereof, and is slid along one pillar. A fixing portion for holding the support device body at the height and fixing the support device main body to the support device and an operation portion thereof are provided.
Also, a locking means for locking the support device to the cross member of the building frame or a pair of guides for preventing the support device from coming off the support column when the support device is slid along the support column. Rollers are provided.
Further, in the frame scaffolding, since the cross member of the building frame becomes an obstacle to the lifting and lowering of the support device, the above-mentioned locking means can be rotated within a predetermined angle in the vertical plane when being lifted or biased by a spring. In addition, the structure that enables the shaft part of the guide roller to move horizontally is devised.
However, since the shaft portion of the guide roller for preventing the movement is movable in the horizontal direction, the guide roller resists the biasing force of the spring or the like when passing through the cross member or when a large force is applied to the supporting device. It has been found that there is a possibility that the support device may be detached from the support column by moving the gap between the guide rollers.
The present invention has been made to solve such problems in the prior art, and a large external force acts on the support device for the preceding handrail described above and other support lifting devices that can be moved up and down along one support. Even so, an object of the present invention is to provide a detachment prevention mechanism that is excellent in safety and that does not cause the support lifting device to be detached from the support.

The present invention is a detachment prevention mechanism for a column lifting device that moves up and down along a column from which a horizontal member protrudes, and the column lifting device opens to the side of the horizontal member in a state where the column is loosely fitted inside. A lifting device body provided with a movement course, and pivotally mounted on both sides of the opening portion of the movement groove so as to be rotatable in a vertical plane, projecting to the opening portion on the outer peripheral portion, and by the locking relationship with the support column And a pair of guide rollers formed with a plurality of locking projections for preventing the lifting device body from being detached from the support column.
As the locking protrusion, at least a central protrusion that extends in a petal shape in the radial direction with respect to the rotation axis of the guide roller, and extends above the central protrusion when the central protrusion is in a horizontal state. An upper protrusion and a lower protrusion that extends downward from the central protrusion are provided. The locking protrusions need not be limited to the three of the center protrusion, the upper protrusion, and the lower protrusion, and may be provided by four or more.
The guide roller is further provided with a biasing means for applying a biasing force for returning the central protrusion to a substantially horizontal state with respect to the rotation of the guide roller. Various springs can be used as the biasing means, but any other means can be used as long as it has a function of returning to the original position with respect to the rotation of the guide roller.
In such a configuration, when the central protrusion hits the cross member when the lifting device body moves up and down along the support column, the central protrusion of the guide roller resists the biasing force of the spring or the like due to the resistance from the horizontal member. The lifting and lowering device body is allowed to move up and down by rotating upwards or downwards, but with the rotation, the lower protrusion or the upper protrusion protrudes into the opening portion of the moving groove, so that the support column and the guide roller And the separation of the column lifting device from the column can be prevented.
The column lifting device can be used, for example, to support a handrail on a scaffold such as a framed scaffold, or when carrying materials along the column. In such a case, the column lifting device is fixed at a predetermined position of the column. As a means to do so, by providing a fixing means that is attached to and detached from the column in the column lifting device itself, the column lifting device can be lifted and fixed smoothly.
As the fixing means, for example, a structure in which a support is sandwiched from both sides, a structure in which a protrusion or a hook-shaped locking portion is provided on the support and locked to this can be used.
Further, in the case where the supporting force by the fixing means of the type as described above sandwiching the support column from both sides is not sufficient, or in order to further enhance the safety, for example, the above-mentioned Japanese Published Patent Publication No. 2003-064863 of the applicant mentioned above. As in the support device for the leading handrail described in the gazette, it is also possible to provide the supporting device for the supporting device for engaging with the cross member protruding from the supporting column and restraining the downward movement.

FIG. 1 is a horizontal cross-sectional view showing an embodiment of a detachment prevention mechanism for a column lifting apparatus according to the present invention.
FIG. 2 is a view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a schematic view showing the operation of the detachment prevention mechanism in the present invention.
FIG. 5 is a schematic diagram showing the operation following FIG.
FIG. 6 is a schematic diagram showing the operation following FIG.
FIG. 7 is a schematic diagram showing the operation following FIG.
FIG. 8 is a schematic partial cross-sectional view showing another example of the urging means in the detachment prevention mechanism of the column lifting device of the present invention.
9 is a cross-sectional view taken along the line CC of FIG.
FIG. 10 is a perspective view showing an example of a support device for a leading handrail as a support lifting device when the present invention is applied to a frame scaffold.
FIG. 11 is a perspective view showing a construction procedure of the frame scaffold using the support device as the column lifting device of FIG.
FIG. 12 is a perspective view showing a construction procedure following FIG.
FIG. 13 is a perspective view showing a construction procedure following FIG.
FIG. 14 is a perspective view showing a construction procedure following FIG.
FIG. 15 is a perspective view showing a construction procedure following FIG.
FIG. 16 is a perspective view showing a construction procedure following FIG.
FIG. 17 is a perspective view showing a construction procedure following FIG.
FIG. 18 is a perspective view showing a construction procedure following FIG.

1 to 3 show an embodiment of the detachment prevention mechanism 1 of the present invention. As shown in the figure, the support 3 provided with the cross member 2 (see FIG. 2) is connected to the cross member 2 side. The column lifting device 4 provided so as to be movable in the vertical direction along the column 3 can be moved up and down over the cross member 2 and detached from the column 3 while being held in the moving groove 4a opened in the column. Is to prevent.
The disengagement prevention mechanism 1 has a plurality of locking mechanisms for preventing the column lifting / lowering device 4 from being detached by a locking relationship with the column 3 when a force to remove the column lifting / lowering device 4 from the column 3 is applied. A pair of guide rollers 6 provided with protrusions 5 on the outer peripheral portion is provided, and the locking protrusions 5 of the pair of guide rollers 6 pivotally attached to the body portion of the lifting device 4 are open portions of the movement grooves 4a. Thus, the locking projection 5 between the lifting device 4 and the guide roller 6 sandwiches the column 3 to prevent the lifting device 4 from being detached from the column 3.
Here, “one pair” means that at least two guide rollers 6 as a pair are required as components of the detachment prevention mechanism 1, and the entire column lifting device 4 provided with the detachment prevention mechanism 1. For example, as shown in the embodiment of FIG. 9 described later, two pairs are provided to ensure stability, and three or more pairs may be provided.
In this way, the detachment prevention mechanism 1 is a pair for preventing separation of the column lifting device 4 by the locking relationship with the column 3 when a force to remove the column lifting device 4 from the column 3 is applied. The guide roller 6 is provided, and a plurality of locking projections 5 are provided on the outer periphery of the guide roller 6.
The locking protrusions 5 of the one or more pairs of guide rollers 6 pivotally attached to the main body portion of the column lifting device 4 project into the opening portion of the moving groove 4a, so that the lifting device 4 main body and the guide roller The locking projection 5 of 6 sandwiches the column 3 to prevent the column lifting device 4 from being detached from the column 3.
More specifically, in this embodiment, the locking projection 5 is a central projection that extends in a direction perpendicular to the axis 3 a of the column 3, protrudes from the opening of the moving groove 4 a, and is locked to the column 3. A portion 5a, an upper projection 5b extending along the axis 3a of the column 3 at an upper position perpendicular to the central projection 5a, and a column 3 at a lower position perpendicular to the central projection 5a. The lower projection 5c extends along the axis 3a.
The guide roller 6 is held so that the rotation around the shaft portion 6 a is restricted by the urging force of the spring 8, and the center protrusion 5 a extends in a direction perpendicular to the axis 3 a of the support column 3. Yes.
The disengagement prevention mechanism 1 is configured such that the center protrusion 5a of the locking protrusion 5 abuts against the cross member 2 during the movement of the column elevating device 4, and the guide roller 6 resists the urging force of the spring 8. By rotating, the central protrusion 5a is rotated upward (when the column lifting device 4 is moved downward) or downward (when the column lifting device 4 is moved upward), so that the locking relationship with the column 3 is established. At that time, the lower protrusion 5c (when the column elevating device 4 is moved downward) or the upper protrusion 5b (when the column elevating device 4 is moved upward) is formed in the opening portion of the movement groove 4a. It can protrude and can maintain a latching relationship with the support | pillar 3. FIG.
In this example, as shown in FIG. 2, the central protrusion 5 a, the upper protrusion 5 b, and the lower protrusion 5 c are provided on the outer periphery of the guide roller 6 so as to have a substantially petal shape. In addition, although it is a petal of 3 directions in FIG. 2, you may provide in more than 4 directions.
In this embodiment, as a means for holding the central projection 5a in a state extending in a direction perpendicular to the axis 3a of the support column 3, as shown in FIG. 3, it is provided on the shaft 6a of the guide roller 6. A small gear 9, a gear plate 10 that is screwed into the small gear 9, and a compression spring 8 that has one end locked on the gear plate 10 and the other end locked on the column elevating device 4 are used.
That is, when the guide roller 6 is rotated, the gear plate 10 is moved through the small gear 9, and the compression spring 8 is compressed by the movement of the gear plate 10, so that this resists the rotation of the guide roller 6. A biasing force will be given.
In the present embodiment, the rotation of the gear plate 10 is restrained by using the compression spring 8 to restrain the locking projection 5 of the guide roller 6 from rotating within a certain range.
In other words, in this example, the central protrusion 5a is held in a state extending in a direction perpendicular to the axis 3a of the support column 3 by the urging force of the compression spring 8, and the rotation of the guide roller 6 is made constant. By suppressing the rotation angle, the rotation angle θ of the central projection 5a is vertically adjusted within a range of 65 ° to 70 ° as shown in FIG.
Further, in this embodiment, as shown in FIG. 1, the column elevating device 4 is formed in a substantially U-shaped cross section from the both side portions 4b and the bottom portion 4c, and is surrounded by the both side portions 6a and the bottom portion 6b. A groove 4a is formed. And the guide roller 6 is pivotally attached to the both sides 4b of this support | pillar raising / lowering apparatus 4. FIG.
FIGS. 4 to 7 show the operation of the detachment prevention mechanism 1 when moving the column elevating device 4 having the detachment prevention mechanism 1 of the present invention having such a configuration to the lower side of the column 3. The guide roller 6 depicts only one side of the column elevating device 4. In addition, when a force is applied to remove the column lifting / lowering device 4, a diagonal line is drawn at a portion where the column 3 and the locking projection 5 abut.
In a state where a force other than the urging force by the spring or the like is not applied to the guide roller 6, as shown in FIG. 4, the central protrusion 5 a that is the protrusion 5 for locking to the support 3 can come into contact with the support 3. By being in the position, the column lifting device 4 is prevented from being detached from the column 3.
When the central protrusion 5a hits the cross member 2 protruding from the support column 3 when the support elevating device 4 is lowered, the guide resists the urging force by the resistance force received from the cross member 2 as shown in FIG. The roller 6 rotates, but the tip of the central protrusion 5a and the tip of the lower protrusion 5c provided in the shape of petals rotate so as to sandwich the cross member 2, and the locking relationship between the guide roller 6 and the column 3 is maintained. The Accordingly, in this state, the column lifting device 4 is not detached from the column 3.
When the support elevating device 4 is further lowered, as shown in FIG. 6, the locking relationship between the central protrusion 5a and the support 3 disappears, but the locking range of the tip of the lower protrusion 5c (the hatched portion). At this time, the locking relationship between the guide roller 6 and the column 3 is maintained, and the column lifting device 4 is not detached from the column 3.
After the position of the cross member 2 has completely passed, the guide roller 6 is returned to the original position by the biasing force of a spring or the like, but in the meantime, one or both of the central protrusion 5a and the lower protrusion 5c are paired. Since the locking relationship between the guide roller 6 and the supporting column 3 is always maintained, the supporting column lifting device 4 should be detached from the supporting column 3 unless an excessively large force is applied so that the guide roller 6 is damaged or falls off. There is no.
The case where the column elevating device 4 descends along the column 3 has been described above. However, when the column elevating device 4 ascends along the column 3, there is always a locking relationship between the central protrusion 5a and the upper projection 5b. Maintained.
Therefore, according to the present invention, the column lifting device 4 does not come off the column 3 at any time when the column lifting device 4 moves up and down along the column 3 from which the cross member 2 protrudes.
8 and 9 show another example of the urging means for the guide roller 6 in the mechanism for preventing the detachment of the column lifting apparatus of the present invention.
In this example, a torsion spring 7 is wound around the shaft portion 6a of the guide roller 6, and when the guide roller 6 rotates and the shaft portion 6a rotates, the torsion spring 7 is twisted. As a result, an urging force acts on the roller 6.
As described above, the biasing means for preventing the rotation of the guide roller 6 by the biasing force and stopping or returning the central convex portion 5a to the original position is not limited to the above-described form, and various forms can be considered. It is done.
Next, a case where the present invention is used for assembling a frame scaffold will be described. FIG. 10 is an explanatory view of a support device 11 for a leading handrail as a support lifting device, and FIGS. 11 to 18 show a construction procedure of a frame scaffold using the support device 11.
The leading handrail support device 11 shown in FIG. 10 has a moving groove 11a inside a support device main body formed in a U-shaped cross section by two rectangular pipes 11b and a connecting portion 11c connecting them. For example, as shown in FIG. 12, it is installed from above the support column 21a so that the support column 21a of the building frame 21 is fitted in the moving groove 11a, and can be moved up and down along the one support column 21a. ing.
In this example, two pairs of guide rollers 6 are provided at approximately the center and the lower end of the support device 11 in the height direction, and the support from the support column 21a is performed according to the principle described with reference to FIGS. The apparatus 11 is prevented from falling off.
Furthermore, in this example, a pipe-shaped handrail holder 13 is provided on the upper portion of the support device 11, and the lower portion of the preceding handrail can be attached to the handrail holder 13.
Fixing to the support column 21a is a state in which the lower portion of the stopper 12 provided on the opening side of the moving groove 11a, that is, the side where the cross member 21b protrudes from the support column 21a of the building frame 21 is locked to the cross member 21b of the building frame 21. Then, the support 21a is sandwiched between the clamps 14 with brake pads attached to the surfaces of the square pipes 11b on both sides on the moving groove 11a side.
As described in Japanese Patent Application Publication No. 2003-0648863 of the applicant, the stopper 12 is pivotally attached to the support device main body (the rectangular pipe 11b portion in the example in the figure), and the lower portion. Is formed of a pair of stoppers 12 biased by a spring or the like so as to be locked to the upper part of the cross member 21b.
When the support device 11 is raised, the stopper 12 collides with the lower side of the cross member 21b, and the stoppers 12 that are axially attached are opened by being pushed by the cross member 21b. When passing the cross member 21b, the stopper 12 returns to its original position by the urging force of a spring or the like, and the lower part of the stopper 12 and the upper part of the cross member 21b come into contact with each other, thereby preventing the support device 11 from descending. Yes.
Although illustration is omitted, in this case, in order to lower the support device 11 along the column 21a, the spring 12 or the like is attached so that the stopper 12 can be forcibly opened when passing the cross member 21b. A mechanism for releasing the force may be provided.
The clamp 14 can be fixed to the column 21a or can be released by an interlocking clamp lever 16 provided on the upper and lower grips 15 of the support device 11.
In the present invention, the fixing means by the stopper 12 and the clamp 14 described above is optional, and other types of fixing means can be provided.
An example of a procedure for assembling a frame scaffold using such a support device for the leading handrail is as follows.
(1) Assembling the building frame 21 (see FIG. 11)
Similar to the assembly of a general framework scaffold, first, the first-layer building frame 21 and scaffolding plate 22 are assembled.
(2) Mounting of the support device 11 (see FIG. 12)
The support device 11 is fitted to one column 21a of the building frame 21 from above, and the clamp 14 is closed and the support device 11 is fixed at a position where the stopper 12 in FIG. 10 hits the cross member 21b of the building frame 21.
(3) Installation of handrail corner (see Fig. 13)
The handrail 31 at the corner is attached to the support device 11. The preceding handrail 31 is attached by inserting the lower end of the preceding handrail 31 into the handrail holder 13 of the support device 11 shown in FIG.
(4) Installation of the handrail straight section (see Fig. 14)
The support device 11 is fitted to one column 21a of the adjacent building frame 21, and the leading handrail 32 of the linear portion is attached to the handrail holder 13 (see FIG. 10).
(5) Assembling the second-layer building frame 21 (see FIG. 15)
When the attachment of the leading handrails 31 and 32 on the first-layer building frame 21 is completed, the second-layer building frame 21 is assembled thereon.
(6) Attaching the brace 21c etc. (see FIG. 16)
Sequentially, the second-layer building frame 21 and braces 21c are attached.
(7) Movement to upper layer of support device 11 (see FIG. 17)
The connection between the leading handrails 31 and 32 is released, the clamp 14 in FIG. 10 is opened, the support device 11 is moved along the column 21a of the second-layer building frame 21, and the stopper 12 hits the upper cross member 21b. At this position, the clamp 14 is closed to fix the support device 11.
(8) Attaching the scaffold plate 22 (see FIG. 18)
The upper scaffolding plate 22 is attached. Thereafter, the same operations as (5) to (8) are repeated.
As described above, the case where the present invention is used for the frame scaffold has been described. However, the present invention is widely applied to the case where there is a cross member that hinders the lifting when the lifting device is lifted and lowered along the support column in addition to the scaffold. Is possible.

Claims (4)

It is a detachment prevention mechanism for the column lifting device that moves up and down along the column from which the cross member protrudes,
The strut lifting device includes a lifting device main body provided with a moving groove that opens to the cross member side in a state in which the strut is loosely fitted inside,
It is pivotally mounted on both sides of the opening portion of the moving groove so as to be rotatable in a vertical plane, and protrudes from the opening portion to the outer peripheral portion so that the lifting device main body is detached from the column due to the locking relationship with the column. A pair of or a plurality of pairs of guide rollers formed with a plurality of locking projections to prevent,
As the protrusion for locking, at least a central protrusion extending in a petal shape in a radial direction with respect to the rotation axis of the guide roller, and above the central protrusion when the central protrusion is in a horizontal state An upper protrusion that extends, and a lower protrusion that extends downward from the central protrusion,
The guide roller is further provided with a biasing means for applying a biasing force for returning the central protrusion to a substantially horizontal state with respect to the rotation of the guide roller.
When the elevating device body moves up and down along the support column, if the central protrusion hits the cross member, the central protrusion of the guide roller moves upward against the biasing force due to resistance from the cross member. Alternatively, the lower protrusion or the upper protrusion protrudes into the opening portion of the moving groove with the rotation while allowing the lowering device body to move up and down while allowing the lifting device body to move up and down. A structure for preventing the column lifting device from coming off, which is configured to maintain a locking relationship with the column. 2. The mechanism for preventing a column lift from coming off according to claim 1, wherein the column lifting device is provided with a fixing means for detachably fixing the column lifting device to the column. 3. The support device according to claim 2, further comprising locking means for locking the support column lifting device to the cross member protruding from the support column and restraining the downward movement. Prevention mechanism of the lifting device of the column. The said support | pillar is a support | pillar of the building frame which comprises a framework scaffold, The said support | pillar raising / lowering apparatus serves as the support apparatus of the leading handrail attached on a framework scaffold, The Claim 1, 2 or 3 characterized by the above-mentioned. A mechanism to prevent the column lifting device from coming off.

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