JP4336917B2 - Ladder mounting structure and ladder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ladder for allowing a person to go up and down to a height of a structure, and more particularly to an attachment structure for attaching a ladder to the structure and a ladder constituting the attachment structure.
[0002]
[Prior art]
Conventionally, in a structure such as a house, a chimney, or a water supply tank, a ladder is installed on a side wall so that a person can move to a high place of the structure. In FIG. 6, the schematic of the ladder installed in the side wall of a structure is shown. The ladder 10 has a plurality of traversing bars 2 disposed horizontally between a pair of parallel columns 1, 1, and is disposed on the structure A as shown in FIG. It is common to install the column 1 by fastening it to the bracket 3.
[0003]
The conventional ladder structure and the fastening method between the ladder and the structure will be described with reference to FIGS.
[0004]
The support column 1 is formed in a cylindrical shape having a substantially D-shaped cross section, for example, and has a vertical flat surface 1a. A groove 11 having a rectangular cross section is continuously formed along the axial direction in the center portion in the width direction of the flat surface 1a, and locking protrusions 11a, As a result of projecting integrally with 11a, the opening of the groove 11 is formed to be narrow, so that when a nut n described later is inserted into the groove 11, it does not come out of the groove 11.
[0005]
Similarly, the crosspiece 2 which is a member constituting the ladder has a main portion 21 which is a cylindrical tube, and both end portions 22 are pressed to form a flat plate. A hole is provided one by one.
[0006]
A nut n is inserted into the groove 11 of the support column 1 with the seating surface facing the flat surface 1a, and a hexagonal bolt b passing through the bolt hole 23 of the foot end 22 is screwed into the nut n. By joining , the crosspiece 2 is fixed to the column 1. In the conventional example, the shaft portion of the bolt b passes through the bottom surface of the groove portion 11.
[0007]
The step rails 2 are arranged horizontally between two struts to form a ladder, and although not particularly limited, the installation interval of the step rails 2 is usually about 300 mm to 400 mm. Yes, the distance between the two struts is usually about 400 mm. Moreover, it is common that the width | variety of one support | pillar is a dimension of about 50 mm which a person can hold with a hand.
[0008]
When the ladder 10 is installed in the structure A, it is installed in the structure using the bracket 3 as shown in FIG. The bracket 3 is Z-shaped steel obtained by bending a plate-like member by 90 ° at two locations, and the bracket 3 is attached to the structure A in advance before attaching the ladder 10 thereto. In the conventional mounting structure of the bracket 3, when the ladder column 1 is fixed to the bracket 3 disposed in the structure, it is set in the same manner as the step rail 2 is fixed. That is, the strut 1 is fixed to the bracket 3 by engaging the hexagon bolt b that penetrates the bolt hole formed in the bracket 3 with the nut n inserted into the groove 11 of the strut 1.
[0009]
[Problems to be solved by the invention]
However, the conventional ladder has the following drawbacks. That is, as shown in FIG. 6B, the ladder 10 is installed with respect to the structure A via the bracket 3, but the installation position of the bracket 3 is a sufficiently strong place on the structure side. 6 (B), the bracket 3 is not necessarily disposed between the traverse 2 and the traverse 2 as shown by 3 (a) in FIG. 6 (B). In the middle, as shown by 3 (b), there may be a bracket 3 disposed at the same position (height) as the step rail 2. If the crosspiece 2 and the bracket 3 are arranged at the same position (height), the position of the crosspiece 2 cannot be changed because the location of the bracket 3 is restricted on the structure side. There was a problem that we had to do it. However, if the position of the step 2 is changed, the step setting interval will change only in the corresponding part, which not only makes the appearance worse, but also when a person climbs to the height of the structure using the ladder It would be dangerous because it would raise and lower the pedestals that were not regularly spaced.
[0010]
Furthermore, the ladder installation work requires confirmation in advance of the position of the bracket 3 arranged in the building for the above-mentioned reasons, which is troublesome and in actual work, the ladder support column 1 and the bracket 3 are combined on site. Later, the position of the tram was often adjusted, and there was a problem in workability.
[0011]
The present invention has been made in view of the above circumstances, and in a ladder that is installed in a structure and can be moved to a high place of the structure, the installation interval of the step rails is constant regardless of the position of the bracket. It is an object of the present invention to provide a ladder mounting structure that can be left as it is and a ladder that constitutes the ladder mounting structure.
[0012]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above-mentioned object, the present inventor, for example, a rivet or a screw, for example, a pedestal installed on a column without being fixed by a member having a high contact surface pressure such as a bolt. The present invention has been completed by finding that it can be fixed with sufficient strength by fastening with a member having a relatively small width.
[0013]
Accordingly, the present invention provides a ladder comprising bridging a plurality of 踏桟 at regular intervals between a pair of posts, a mounting structure of a ladder attached to the wall of the structure through a bracket, to the post A vertical flat surface is formed, and both end portions of each step pedestal are attached to the vertical flat surface, and the ladder attachment end portions of the brackets are attached to the vertical flat surfaces outside the attachment positions of the both end portions of the step pedestals with respect to the two columns. that attach the there is provided a ladder mounting structure according to claim. In this case, as a ladder , a plurality of steps are spanned between a pair of support columns at regular intervals, and the support columns are vertically flat in a ladder that attaches both the support columns to the wall of the structure via brackets. A groove having a narrow opening along the axial direction is formed continuously on the vertical flat surface, and both end portions of each step rail are both inside the groove. It is attached to the vertical flat surface of the column, and the bolt shaft portion is inserted from the bolt insertion hole formed at the mounting end of the bracket with the bolt head inserted into the groove and the bolt shaft portion protruding from the column flat surface. After passing, the ladder and the bracket are preferably fixed by screwing the bolt and nut .
[0014]
Therefore, according to the present invention, in the ladder support, the fastening position of the bracket and the fastening position of the traverse do not interfere with each other, and the fastening position of the bracket and the fastening position of the traverse are the same position (height) even in), either be fastened to without any trouble strut, it is possible to install also a bracket installation position from the structure side is restricted at any position of the ladder, the fastening of the case bracket ladder Stepping it is not necessary to move the crosspiece, it can be attached to the strut 踏桟 at constant intervals. Moreover, in this way may not change the engaged position of 踏桟 relative engagement position of the bracket, for fastening position of 踏桟 does not interfere when fastening the bracket, the site with the 踏桟 in as in the prior art There is no need to change, and at the construction site, it is only necessary to attach the column to the bracket, so that the construction can be simplified.
[0015]
Further, even in the ladder of the manufacturing process, when mounting the 踏桟 respect to the column, the use of the blind rivet, so to speak easily 踏桟 can enter into with respect to the column with a single touch, the manufacturing process can be simplified, In addition, the manufacturing cost can be reduced by changing the fastening member from a bolt to a blind rivet having a low unit price.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, since the structure of a support | pillar, a footbridge , and bracket itself is the same as that of the case of FIGS. 3-6, the same referential mark is attached | subjected to the same component and the description is abbreviate | omitted. As shown in the figure, the ladder is such that a foot 2 and a bracket 3 are fixed to a column 1, and a number of rivet holes 12 are arranged along the axial direction near the inner end of the flat surface 1 a of the foot 2. The blind rivets r are inserted into these rivet holes 12 and driven into the rivet holes 12 so that the step rail 2 is fastened to the flat surface 1a by the blind rivets r, and the bracket 3 is fastened to the fastening position of the step rail 2. On the outer side, it is fixed by a bolt b and a nut n inserted into the support groove 11.
[0017]
That is, by aligning the rivet hole 23 formed in the flat plate portion of the traverse end 22 with the rivet hole 12 of the support column and fastening both members with the blind rivet r to the support column 1, A ladder 2 is formed by fixing the crosspiece 2 to 1. At this time, the flat surface of the column and the end surface of the foot are in contact with each other about the width 1/3 of the flat surface of the column, and the foot is fixed without interfering with the groove on the flat surface.
[0018]
On the other hand, the bracket 3 is fastened to the column by a hexagonal bolt b and a nut n, and the threaded portion of the hexagonal bolt b whose head is inserted into the groove 11 of the column is passed through the hole of the bracket 3. It is fixed with a nut n.
[0019]
As shown in FIG. 1, the portion of the bracket 3 that is in contact with the support flat surface 1a is about 2/3 the width of the support post flat surface 1a, and the tram 2 and the bracket 3 are arranged at the same height. When this is done, the end of the crosspiece 2 and the end of the bracket face each other with a gap of several millimeters.
[0020]
That is, the bracket 3 can be disposed on the support column 1 without being interfered with by the crosspiece 2, and the groove 11 formed in the support column 1 extends over the entire length of the support column 1. The mounting position, that is, the bracket 3 mounting position can be arbitrarily set.
[0021]
The other end of the bracket 3 that is not fastened to the column 1 is bolted to the side wall of the structure A, whereby the ladder 10 is installed on the structure A. Further, in the embodiment, the head portion of the bolt b is inserted into the groove portion 11, and the bolt b with the shaft portion passing through the hole portion of the bracket 3 holds the head portion and the bracket 3 with the nut n. It is designed to be pressed, so that the fastening can be performed more easily and reliably.
[0022]
Further, in this embodiment, it is fastened by the two posts 1, 1 and 踏桟 both end portions 22 and the blind rivet r respectively, as described above. The blind rivet r is composed of two members, a cylindrical shaft having a head abutting on the surface of the member and a shaft portion inserted into the cylindrical shaft portion, and the shaft portion inserted inside is pushed in. Alternatively, by pulling out, the diameter of the cylindrical shaft is expanded and the members are fastened, and two members can be fastened by work from one direction. For this reason, it is convenient when fastening a member to a place where one end portion of the rivet cannot be suppressed, and the traversing end portion 22 that is a plate-like member is attached to the column 1 that is a hollow member as in this embodiment. The blind rivet r is preferably used for fastening, and the blind rivet r can be fastened with a single touch. Therefore, the workability is advantageous compared to other fastening methods. Further, since the blind rivet r itself is less expensive than the bolt, when manufacturing the ladder 10, the material cost can be reduced and the workability can be reduced as compared with the case where the conventional bolt and nut are used as the fastening method. As a result of this improvement, the ladder manufacturing cost can be reduced.
[0023]
In addition, about the fixing method of the bracket 3, although it fixes only with the volt | bolt b and the nut n in a present Example, it is not specifically limited, In consideration of the thing when the volt | bolt b loosens, it fixes more. In order to make sure, it is possible to provide a more preferable embodiment in which a hole penetrating both members is provided in the bracket 3 and the support flat surface and a rivet r and a screw are inserted. Further, as a method of screwing the bolt b and the nut n, the nut n may be inserted into the column groove 11 and the bolt b may be inserted from the bracket 3 side and screwed into the nut n as in the conventional example. Other configurations may be appropriately changed without departing from the gist of the present invention.
[0024]
【The invention's effect】
As described above, according to the present invention, when installing a ladder on the side wall of the structure such as, without shifting the 踏桟 position ladder, be attached to the installation bracket disposed on the structure It is possible to prevent the function of the ladder from deteriorating due to the change in the distance between the traverses , and to improve the workability when installing the ladder in the structure.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a ladder mounting member according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a ladder attachment member according to an embodiment of the present invention, and shows an AA arrow view in FIG.
FIG. 3 is a schematic view showing a ladder mounting member of a conventional example.
FIG. 4 is a cross-sectional view of a ladder mounting member according to a conventional example, and shows a view taken along the line AA in FIG.
FIG. 5 is a cross-sectional view of a ladder mounting member according to a conventional example, and shows a view taken along the line BB in FIG.
6A and 6B are schematic views showing a ladder according to a conventional example, in which FIG. 6A is a schematic front view, and FIG. 6B is a schematic side view when actually installed in a structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Ladder 1 Support | pillar 1a Flat surface 11a Locking ridge 11 Groove part 12 Rive hole 2 Step bar 21 Step bar body part 22 Step bar end 23 Rivet hole 3 Bracket A Structure b Bolt n Nut r Rivet (Blind rivet)

Claims (5)

A ladder mounting structure in which a ladder formed by laying a plurality of step bars between a pair of columns at regular intervals is attached to a wall of a structure via a bracket, and a vertical flat surface is formed on the column. , attaching the ends of each踏桟to the vertical flat face, that attach the ladder attachment end of the bracket to the vertical flat surface of the outer respectively from the mounting position of each 踏桟 both end portions with respect to the both pillar A ladder mounting structure characterized by In the state where a groove having a narrow opening portion along the axial direction is formed in the vertical flat surface of the support column and the bolt head is inserted into the groove and the bolt shaft portion protrudes from the support flat surface, the bracket is attached. after passing the bolt shank from the bolt insertion hole formed in the end portion, the ladder mounting structure according to claim 1, wherein the fixed and the support column and the bracket by screwing the bolts and nuts. A ladder mounting structure in which a ladder formed by suspending a plurality of step bars between a pair of columns at regular intervals is attached to a wall of a structure via a bracket, and is axially disposed on a vertical flat surface of the column. A narrow groove is formed along the opening, and a bolt head is inserted into the groove and the bolt shaft protrudes from the post flat surface. A ladder mounting structure characterized in that after passing through the bolt shaft portion, the column and the bracket are fixed by screwing the bolt and nut together. In a ladder in which a plurality of steps are spanned between a pair of struts at regular intervals, and the struts are attached to the wall of the structure via brackets, the struts are formed in a cylindrical shape having a vertical flat surface. In addition, a groove having a narrow opening portion is formed continuously along the axial direction on the vertical flat surface, and both ends of the step rails are attached to the vertical flat surfaces of both columns inside the groove. The bolt head portion is inserted into the groove and the bolt shaft portion protrudes from the flat surface of the column, and the bolt shaft portion is passed through the bolt insertion hole formed in the mounting end portion of the bracket. A ladder characterized by fixing the support column and the bracket by screwing a nut and a nut. The ladder according to claim 4, wherein both the struts are fastened to the both ends of the traverse with blind rivets.

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