JP6945839B2 - Ladder fixing bracket - Google Patents

Description

The present invention relates mainly to a ladder fixing bracket for vertically connecting ladders used in scaffolding work and the like.

Conventionally, when a temporary scaffold is assembled at a construction site and an elevating ladder is attached between the upper and lower scaffolds, the ladder may be connected and fixed above and below. Further, in a work stage or a suspended scaffold for steel frame construction, the distance between the scaffolds may be about 6 m, and it may be necessary to connect and fix a plurality of ladders.

For example, Patent Documents 1 to 3 relate to a connector for connecting a ladder and a scaffold for connecting a ladder.

Patent Document 1 describes a telescopic ladder and its connector. The connector is locked / released from a frame body fixed to one of the two stacked side columns and having a portion facing the other side column, and a locked portion formed on the other side column. By sliding the locking portion, the wedge member that is slidably fitted between the other side column and the frame, and the other side column by pressing the other side column against one side column. It has an operation unit that temporarily fixes the frame and the side pillars.

Patent Document 2 describes a method for fixing a temporary ladder in which both ends of the step horizontal pipe member are open to the outer surfaces of the left and right vertical timbers. A fixing bracket consisting of an insertion rod that can be inserted into the horizontal pipe material for steps and a support rod that connects to the outer end of the insertion rod is used, and the insertion rod of the fixing bracket is placed at an appropriate height on the ladder. In the state of being inserted into the pipe material, the support rod portion of the fixing bracket and the structure located around the ladder or the connecting member fixed to the structure are connected by a clamp.

Patent Document 3 describes a fixing bracket for an elevating ladder to be attached to a temporary scaffold made by assembling a plurality of vertical members, horizontal members, scaffolding boards, and the like. A pair of substantially U-shaped holding pieces that hold the pedestal of the ladder are provided substantially in parallel, and the base ends of these holding pieces are connected to each other by a flat plate-shaped guide member to form a fixing bracket main body. , While a slit of a predetermined length is bored in the guide member substantially parallel to each holding piece, a support bolt at the base of the locking clamp that locks to the cross member of the temporary scaffold is inserted through the slit to make it slidable. When fixing the ladder to the temporary scaffold, lock the cross member of the temporary scaffold with the locking clamp while holding the pedestal of the ladder with the holding piece, and fix the fixing bracket body along the slit. The ladder is slid to the cross member side, and the pedestal of the ladder is clamped and fixed between the holding piece and the cross member of the temporary scaffold.

Utility Model Registration No. 3127879 Japanese Unexamined Patent Publication No. 2004-108064 Japanese Unexamined Patent Publication No. 2012-158944

The method described in Patent Document 1 is provided at a connecting portion when the side pillars of the upper and lower ladder bodies are overlapped and the side pillars are slid in a stretchable ladder to make the length of the ladder a desired length. The upper and lower side columns can be temporarily fixed by inserting a wedge member, but it is not suitable when the number of ladders is large and lacks stability.

The method described in Patent Document 2 is an L-shaped fixing bracket, and is composed of an insertion ladder portion made of a pipe material and a support ladder portion made of a pipe material fixed to one end of the insertion rod portion in a right angle direction. However, it can be used only for ladders in which both ends of the horizontal pipe material for steps are open to the outer surfaces of the vertical materials on both the left and right sides.
The method described in Patent Document 3 connects the temporary scaffolding and the ladder, and cannot connect the ladders to each other.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a ladder fixing bracket capable of safely and easily connecting and fixing ladders up and down.

The ladder fixing bracket according to the present invention is a ladder fixing bracket for vertically connecting and fixing ladders having a plurality of step rails provided in parallel between two columns, and sandwiches the columns from both sides in the width direction of the ladder. A U-shaped cross section is formed from the pair of holding portions and the connecting portion connecting the pair of holding portions, and the tread rail fitting groove for fitting the tread rail from the thickness direction of the ladder into at least one of the pair of holding portions. Is provided, and a fastener is provided between the tips of the pair of holding portions to prevent the treads from coming off, and the positions where the treads of the ladder connected vertically are arranged side by side. Then, the support of the ladder is sandwiched from the width direction of the ladder by the pair of holding portions so that the two step rails of the upper and lower ladders arranged side by side are fitted into the step rail fitting groove. It is a feature.

With the step ladders of the ladders to be connected vertically arranged side by side, the ladder columns are connected by a pair of holding parts so that the two step ladders of the upper and lower ladders arranged side by side are fitted into the step ladder fitting groove. Insert from the width direction. A fastener can be provided between the tips of the pair of holding portions to fix the ladder fixing bracket to the ladder support so that the step bar does not come out of the ladder fixing bracket.

The fastening method and form of the fastener are not particularly limited, but for example, an openable / closable fastener that is pivotally supported by one of the tips of the pair of holding portions and locked and fixed to the other can be used. The fastener may be attached to the ladder fixing bracket in advance and integrated, or may be a fastener separate from the ladder fixing bracket.

It is preferable that rib-shaped folded portions that sandwich the tread rail from above and below are formed above and below the tread rail fitting groove.
By providing rib-shaped folded portions above and below the treadle fitting groove, the rigidity of the ladder fixing bracket itself is increased. In addition, the step ladder is fitted into the stepping rail fitting groove to prevent shaking when the ladder is raised and lowered, and has the effect of stabilizing the ladder.

A clamp metal fitting may be provided integrally or detachably on the back side of the connection portion of the ladder fixing metal fitting. By providing a clamp metal fitting on the back side of the connecting portion of the ladder fixing metal fitting, it is possible not only to connect and fix the ladders to each other but also to connect and fix the ladder to a single pipe such as a temporary scaffold.

Further, the ladder fixing bracket according to the present invention fixes a ladder in which a plurality of step bars are provided in parallel between two columns to a scaffold member constituting the scaffold, and the columns are fixed in the width direction of the ladder. A pair of sandwiching portions sandwiched from both sides and a connecting portion connecting the pair of sandwiching portions are formed in a U-shaped cross section, and a step for fitting a step bar into at least one of the pair of sandwiching portions from the thickness direction of the ladder. A crosspiece fitting groove is provided, and a fastener is provided between the tips of the pair of holding portions to prevent the stepladder from coming off, and a clamp metal fitting is integrally provided on the back side of the connecting part. Alternatively, it is detachably provided, and the support of the ladder is sandwiched from the width direction of the ladder by the pair of holding portions so that the step ladder of the ladder is fitted into the stepping rail fitting groove, and the scaffolding is provided by the clamp metal fitting. It is characterized by being fixed.

The ladder fixing bracket of the present invention can be used not only for connecting ladders to each other, but also for stabilizing the ladder by connecting and fixing the ladder to a scaffold member constituting a temporary scaffold or the like in combination with a clamp fitting.

Since the ladder fixing bracket according to the present invention has the above-described configuration, it is possible to safely and easily connect and fix ladders in which a plurality of step bars are provided in parallel between two columns.

Further, by providing a clamp metal fitting to the ladder fixing metal fitting, the ladder can be connected and fixed to a temporary scaffolding or the like, and the ladder can be prevented from swinging.

It is a perspective view which shows the main part in the use state in one Embodiment of the ladder fixing metal fitting which concerns on this invention. It is a perspective view which shows only the ladder fixing metal fitting of the embodiment of FIG. (a) is a plan view of the ladder fixing bracket of the embodiment of FIG. 1, (b) is a front view, (c) is a rear view (a view from the step ladder side of the ladder), and (d) is a right side view. .. FIG. 5 is a perspective view showing a state in which ladders are connected and fixed vertically in the embodiment of FIG. It is a perspective view which showed the mode that the ladder is fixed to the member to the scaffolding in another embodiment of the ladder fixing metal fitting which concerns on this invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

1 to 4 show an embodiment of the ladder fixing bracket 1 according to the present invention, and FIGS. 1 and 4 show how the ladders are connected and fixed vertically.

As shown in FIGS. 2 and 3, the ladder fixing bracket 1 has a U-shaped cross section formed from a pair of sandwiching portions 2a and 2b and a connecting portion 3 connecting the sandwiching portions 2a and 2b. One of the sandwiching portions 2b is provided with a treadle fitting groove 4, and rib-shaped folded-back portions 6 are provided above and below the treadle fitting groove 4. By providing the folded-back portions 6 above and below the treadle fitting groove 4, the rigidity of the ladder fixing bracket 1 itself can be increased.

Further, as shown in FIG. 1, a wide contact area can be obtained by sandwiching the step ladders 13a and 13b of the upper and lower ladders 11a and 11b from above and below, so that the ladders 11a and 11b connected vertically are stable. It can be fixed by the ladder, and the shaking when the ladders 11a and 11b are raised and lowered is also reduced.

A bent piece portion 7 bent outward is formed at the tip end portion of the other sandwiching portion 2a. By providing the bent piece portion 7, it becomes easy to insert the ladder fixing bracket 1 when attaching the ladder fixing bracket 1 to the support column 12 of the ladder 11. Further, a horizontally long eyebolt penetration hole 8 through which the eyebolt 5a constituting the fastener 5 is inserted over the bent piece portion 7 is formed at the tip end portion of the sandwiching portion 2a.

The fastener 5 in the present embodiment is composed of an eyebolt 5a, a nut 5b, a locking round bar 5c passed through the hole of the eyebolt 5a, and the like, and the tip of the eyebolt 5a passed through the eyebolt penetration hole 8 of the holding portion 2a described above. The locking round bar 5c is locked in the locking groove 6a formed in the folded-back portion 6 of the other sandwiching portion 2b, and the nut 5b is tightened and fixed.

The eyebolt penetration hole 8 provided in the sandwiching portion 2a is fixed with a nut 5b in a state where the eyebolt 5a is penetrated. The ladder fixing bracket 1 can be attached to the support column 12 of the ladder 11 with the 5 attached.

FIG. 4 shows how the ladders 11a and 11b are connected and fixed vertically in the present embodiment. In the connection work, first, the columns 12a and 12b are overlapped in the thickness direction so that the step ladders 13a and 13b of the upper and lower ladders 11a and 11b to be connected are arranged side by side.

Insert the support columns 12a and 12b into the ladder fixing bracket 1 from the thickness direction of the ladders 11a and 11b so that the step ladders 13a and 13b are fitted into the stepping rail fitting groove 4, and insert the locking round bar 5c of the fastener 5. By locking the eyebolt 5a in the locking groove 6a and tightening the eyebolt 5a with the nut 5b, the columns 12a and 12b and the treads 13a and 13b are fixed in the holding portions 2a and 2b of the ladder fixing bracket 1.

The fixing by the ladder fixing bracket 1 is performed at the same height of the columns 12a and 12b on both sides of the ladders 11a and 11b. The connection by the ladder fixing bracket 1 is not limited to one place, and a more stable connection state can be obtained by performing the connection at two or more steps.

FIG. 5 shows an embodiment in which the ladder 11 is fixed to a member constituting the scaffold by using the ladder fixing bracket 1 of the present invention. For example, it can be used when the lower part of the ladder in the suspended state is fixed to a single pipe 15 or the like of the scaffold to stabilize it.

In the present embodiment, the clamp metal fitting 14 is attached to the clamp metal fitting hole 9 (see FIG. 3) of the connection portion 3 of the ladder fixing metal fitting 1.

In the present embodiment, only one ladder 11 is fixed to the ladder fixing bracket 1, but for example, the lower portion of the support column 12 of the ladder 11 in the suspended state and the tread 13 at the position thereof are shown in FIG. 4 described above. By the same operation as in the embodiment, the ladder fixing bracket 1 is fixed in the holding portions 2a and 2b.

In that state, by fixing the scaffolding to the single pipe 15 or the like with the clamp metal fitting 14, the ladder 11 whose lower end is suspended in the middle can be eliminated and stabilized.

If the spacer 16 having a size corresponding to the cross section of the support column 12 of the ladder 11 is sandwiched together in the holding portions 2a and 2b of the ladder fixing bracket 1, the ladder fixing bracket 1 as in the embodiment of FIG. 4 can be obtained. The one to which the clamp metal fitting 14 is attached can be used.

1 ... Ladder fixing bracket, 2a, 2b ... Clamping part, 3 ... Connecting part, 4 ... Stepping rail fitting groove, 5 ... Fastener, 5a ... Eyebolt, 5b ... Nut, 5c ... Locking round bar, 6 ... Folded part , 6a ... Locking groove, 7 ... Bending piece, 8 ... Eyebolt penetration hole, 9 ... Clamp metal fitting hole,
11 ... Ladder, 11a ... Upper ladder, 11b ... Lower ladder, 12 ... Support, 12a ... Upper ladder support, 12b ... Lower ladder support, 13 ... Step rail, 13a ... Upper ladder step Rail, 13b ... Lower ladder tread,
14 ... Clamp metal fittings, 15 ... Scaffolding single pipe, 16 ... Spacer

Claims (5)

A ladder fixing bracket for vertically connecting and fixing ladders having a plurality of step ladders provided in parallel between two columns, and a pair of holding portions for sandwiching the columns from both sides in the width direction of the ladder and the pair. It is formed in a U-shaped cross section from the connecting portion connecting the sandwiching portions, and at least one of the pair of sandwiching portions is provided with a tread rail fitting groove for fitting the tread rail from the thickness direction of the ladder. A fastener is provided between the tips of the pair of holding portions to prevent the step ladder from coming off, and the step ladders connected vertically are arranged side by side. It is characterized in that the support of the ladder is sandwiched from the width direction of the ladder by the pair of holding portions so that the two step rails of the upper and lower ladders arranged side by side are fitted into the step rail fitting groove. Ladder fixing bracket. The ladder fixing bracket according to claim 1, wherein the fastener is an openable / closable fastener that is pivotally supported by one of the tips of the pair of holding portions and locked and fixed to the other. securing bracket. The ladder fixing bracket according to claim 1 or 2, wherein rib-shaped folded portions for sandwiching the stepping rail from above and below are formed above and below the stepping rail fitting groove. The ladder fixing bracket according to claim 1, 2 or 3, wherein a clamp fitting is integrally or detachably provided on the back surface side of the connection portion. A ladder fixing bracket for fixing a ladder having a plurality of step rails provided in parallel between two columns to a scaffold member constituting the scaffold, and a pair of holding portions for sandwiching the columns from both sides in the width direction of the ladder. It is formed in a U-shaped cross section from the connecting portion connecting the pair of holding portions, and at least one of the pair of holding portions is provided with a tread rail fitting groove for fitting the tread rail from the thickness direction of the ladder. A fastener is provided between the tips of the pair of holding portions to prevent the stepladder from coming off, and a clamp metal fitting is integrally or detached on the back side of the connecting portion. The step ladder is possibly provided, and the support of the ladder is sandwiched from the width direction of the ladder by the pair of holding portions so that the step ladder of the ladder is fitted into the stepping rail fitting groove, and is fixed to the scaffold by the clamp metal fitting. Ladder fixing bracket that is characterized by the above.

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