JP3035100U - Work ladder - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a work ladder capable of easily performing work such as cleaning and washing of roof glass of a greenhouse on a weak roof without burdening the building or the roof. It is an issue. A vertical ladder portion (10) is a work ladder including a pair of side rods (1) made of metal pipe and a large number of metal step rods (2) arranged between them. An inclined ladder portion 20 extending obliquely upward from the tip of the vertical ladder portion 10; and a slant ladder portion 20 provided at the tip of the inclined ladder portion 20 that abuts against the ridge of the roof so that it does not come off. And a hook 3 for attaching a safety tool provided near the tip of the ladder.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a work ladder for working on a roof.

[0002]

[Prior art]

 Conventionally, when working on a roof, it is common for a worker to climb a ladder standing on the edge of the roof and go up onto the roof using a ladder to work or move while stepping on the roof. there were.

[0003]

[Problems to be solved by the device]

 However, when working on a roof with low strength, such as when cleaning or cleaning the roof glass of a greenhouse, it is virtually impossible to step on or walk on the roof. Therefore, even if there was a ladder to go up to the roof, there was a problem that we could not actually work on the roof. For this reason, conventionally, in greenhouses, etc., it is necessary to keep the roof glass clean especially due to the problem of sunshine, but since there is no suitable work ladder, the roof glass can be kept clean for a long period of time. In many cases, the result was left unattended.

In view of the above-mentioned conventional circumstances, the present invention can easily perform work such as cleaning and washing roof glass of a greenhouse on a weak roof without burdening the building or the roof. The task is to provide a work ladder that can be done.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the work ladder of the present invention is a work ladder consisting of a pair of side rods made of metal pipes and a large number of metal step rods arranged between them. A vertical ladder part that is erected, a slanted ladder part that extends obliquely upward from the tip of the vertical ladder part, and a slanted ladder part that is provided at the tip of the slanted ladder part so that it can be rolled up from above the ridge of the roof. The first feature is that it has a bent portion that abuts and acts as a stopper, and a hook for attaching a safety device that is provided near the front end of the ladder. Further, in addition to the above-mentioned first characteristic, the working ladder of the present invention has a second characteristic that the lengths of the vertical ladder portion and the inclined ladder portion are adjustable. In addition to the first or second characteristic, the work ladder of the present invention is characterized in that the inclined ladder portion extending obliquely upward from the front end of the vertical ladder portion can adjust its inclination angle. It is a feature of.

According to the first feature, the worker stands the work ladder made of the metal pipe on the vertical ladder portion on the ground or the like, and brings the bent portion of the tip into contact with the ridge portion of the roof, whereby the inclined ladder. The work ladder can be installed in such a way that the part is located slightly above the slope of the roof. The bent portion provided at the tip of the inclined ladder portion comes into contact with the ridge portion of the roof so as to be rolled up from above, and plays a role of a stopper. Workers can climb the vertical ladder and perform roofing work such as cleaning and cleaning of the roof glass without burdening the roof while resting on the inclined ladder on the roof. By moving the work ladder little by little in the longitudinal direction of the roof and repeating the work, the work of the entire roof can be performed. The pair of side rods can be made light and strong by using metal pipes. In addition, by installing a hook for attaching safety equipment near the tip of the ladder, it is possible to attach a lifeline or prevent the ladder from being removed from the ridge of the roof by a rope. Since the bent portion at the tip of the inclined ladder portion comes into contact with the roof ridge so as to be rolled up, it prevents the work ladder from coming off and prevents the work ladder from falling off the roof during work. Also, when the work ladder is moved in the longitudinal direction of the roof, it is possible to prevent the work ladder from being largely disengaged from the roof due to the bent part appropriately hanging on the roof ridge. It can be moved easily and smoothly without losing balance. Since the ridge of the roof is made of a strong material such as metal even in greenhouses or the like, it does not crack or break even if the bent portion of the working ladder tip comes into contact with it. According to the second feature, in addition to the action and effect of the first feature, since the lengths of the vertical ladder portion and the slanted ladder portion can be adjusted, respectively, the height up to the roof of a building such as a greenhouse is increased. The length of the vertical ladder and the sloped ladder can be adjusted according to the slope length of the roof and the roof, and the work ladder can be made suitable for the size of the building. According to the third feature described above, in addition to the action and effect of the first or second feature, the tilt angle of the tilted ladder with respect to the vertical ladder can be adjusted, so that the angle of the roof of the building can be adjusted. Therefore, it is possible to surely obtain an appropriate angle of the inclined ladder portion according to the inclination of the roof, such as setting the same angle as that angle.

[0007]

[Embodiment of the invention]

 FIG. 1 is an overall perspective view showing the work ladder of the present invention arranged with respect to a greenhouse. FIG. 2 shows an embodiment of the work ladder of the present invention, (A) is a side view of the work ladder, and (B) is a front view. FIG. 3 is a detailed view of a lower end portion of the work ladder that contacts the ground. FIG. 4 is a detailed view illustrating an example of a mechanism for adjusting the length of the work ladder, (A) is a front view, and (B) is a side view. FIG. 5 is a detailed view illustrating an example of a mechanism for adjusting the angle of the work ladder.

First, referring to FIGS. 1 and 2, the work ladder R of the present invention can be preferably used as a work ladder for cleaning and washing a glass roof of a greenhouse or the like. Of course, it can also be used for roofing of other houses or factories with slanted roofs. FIG. 1 shows an example in which the work ladder R of the present invention is placed in a greenhouse G. The work ladder R is erected on the ground and its tip is located at the ridge G ₁ of the roof of the greenhouse G. They come in contact with each other from the top, and do not come into contact with the greenhouse G, especially the glass roof, at other places.

The work ladder R includes a vertical ladder portion 10, an inclined ladder portion 20 and a downward bent portion 30. The vertical ladder portion 10 is a portion that is erected substantially perpendicularly to the ground. The inclined ladder portion 20 is a portion that extends obliquely upward from the tip of the vertical ladder portion 10. The downward bent portion 30 is a portion attached to the tip of the inclined ladder portion 20 and abutted on the ridge portion G ₁ of the roof of the greenhouse G so as to be rolled in from above. The vertical ladder portion 10 and the slanted ladder portion 20 can be manufactured by separately manufacturing them separately by welding or the like. Although not shown, the connecting portion may be provided with a connecting reinforcing member to improve the strength. The bent portion 30 can be manufactured integrally with the inclined ladder portion 20 from the beginning. In that case, the portion corresponding to the bent portion 30 is bent. Of course, the bent portion 30 may be separately formed and may be integrally connected to the inclined ladder portion 20 by welding or the like.

When the work ladder R including the vertical ladder portion 10, the inclined ladder portion 20 and the bent portion 30 is viewed as a whole, the work ladder R includes a pair of side rods 1 and a plurality of step rods arranged between them. 2 and a pair or a plurality of pairs of hooks 3 attached near the tip of the work ladder R. The side rod 1 is composed of a metal pipe made of aluminum or stainless steel, but the kind and cross-sectional shape of the material are not particularly limited as long as it is a light and strong material. The step rod 2 serves as a step constituting a step ladder, and can be made of the same metal pipe as the side rod 1 and having a slightly smaller diameter. However, it does not have to be a pipe, and can be formed into a shape suitable for a worker to go up and down. Further, the material may be any material as long as it has the strength necessary for the step, and the type and cross-sectional shape of the material are not particularly limited. The hook 3 is useful for attaching a worker's lifeline or the like, or for attaching the work ladder R to a ridge of the roof or the like so as not to come off with a rope.

Referring to FIG. 3, the lower end of the vertical ladder portion 10 has a wide ground plate 11 attached to the lower ends of the pair of side rods 1 and 1 by welding or the like, and is placed on the ground or a foundation on it. The contact area with the platform is widened to ensure the stability of the standing of the vertical ladder section 10 when the work ladder R is installed. In addition, instead of providing the wide ground plate 11 at the lower end of the vertical ladder portion 10, it can be replaced with a pointed insertion stabilizing member as needed so that it can be inserted and stabilized on the ground. May be.

The vertical ladder section 10 and the inclined ladder section 20 are both adjustable in length or length. Since it is expected that the height from the ground to the roof in a building such as greenhouse G will change from building to building, the length of the vertical ladder section 10 can also be adjusted. Similarly, it is expected that the length of the roof of a building such as a greenhouse G in the direction of inclination will vary from one building to another, so the length of the sloping ladder portion 20 can be adjusted. This makes it possible to appropriately arrange the work ladder R corresponding to a building such as a greenhouse G having various heights and inclined lengths of roofs. The lengths of the vertical ladder portion 10 and the inclined ladder portion 20 can be adjusted by connecting a plurality of divided ladder portions so that the lengths can be freely adjusted. That is, in the present embodiment, referring to FIG. 2, the work ladder R is composed of a plurality of small-diameter ladder portions A and a large-diameter ladder portion B, and the small-diameter ladder portions A and the large-diameter ladder portions B are perpendicular to each other. The lengths of the vertical ladder portion 10 and the inclined ladder portion 20 can be adjusted by connecting the ladder portion 10 and the slanted ladder portion 20 so that their lengths can be adjusted.

The small-diameter ladder portion A and the large-diameter ladder portion B are both configured to be easily carried, and the small-diameter ladder portion A has a pair of side rods 1 and 1 whose diameter is larger than that of the large-diameter ladder portion B. The diameters of the pair of side rods 1, 1 are made slightly smaller, so that the side rods 1, 1 of the small-diameter ladder portion A can be used as a sheath tube to enter the side rods 1, 1 of the large-diameter ladder portion B. I am trying. Then, the length of the vertical ladder portion 10 and the inclined ladder portion 20 can be adjusted by adjusting the amount of penetration. With reference to FIG. 4, the connection fixing and the length adjustment of the small diameter ladder portion A and the large diameter ladder portion B will be described. Both the side rods 1 of the small-diameter ladder portion A and the side rods 1 of the large-diameter ladder portion B are configured as pipes, and the pair of side rods 1 and 1 of the small-diameter ladder portion A are a pair of side rods of the large-diameter ladder portion B. The diameter is slightly smaller than that of 1, 1. The side rods 1 and 1 of the small-diameter ladder portion A and the side rods 1 and 1 of the large-diameter ladder portion B are provided with pin holes 1a for attaching the step rods 2 at the same intervals. First, in the small-diameter or large-diameter ladder portions A and B, the step rod 2 can be attached to the pair of side rods 1 and 1 as follows. That is, the pin 2a is passed through the pair of side rods 1, 1 through the pin hole 1a of the one side rod 1, the step rod 2 is passed through the pin 2a, and the pin 2a is passed through the other side rod 1 by means of the female screw 2b or the like. Tighten and fix. This allows the step rod 2 to be mounted and arranged between the pair of side rods 1, 1. The detent of the step rod 2 with respect to the pin 2a and the detent of the pin 2a with respect to the side rods 1 and 1 can be performed by a detent pin (not shown). Next, when the length is adjusted by the small-diameter ladder portion A and the large-diameter ladder portion B, first, the side rod 1 in the range of the length adjustment of the small-diameter ladder portion A and the large-diameter ladder portion B is used. For one copy, remove the step rod 2 in advance. Then, the pair of side rods 1 and 1 of the small diameter ladder portion A are inserted into the pair of side rods 1 and 1 of the large diameter ladder portion B to adjust the connection length. The unit of the adjustment length in this case is the distance between the pin holes 1a. When the insertion length position is determined, the pin hole 1a of the side rod 1 of the large diameter ladder portion B and the pin hole 1a of the side rod 1 of the small diameter ladder portion A are aligned, and then the pin 2a is overlapped from one side. It was passed through the pin holes 1a, 1a of the large and small side rods 1, 1 and further through the step rod 2, and the other remaining overlapping rods of the large and small side rods 1, 1 were passed through the pin holes 1a, 1a. Then, tighten the female screw 2b etc. to fix. Due to this, for adjusting the length, the step rod 2 is attached at the portion where the side rod 1 of the small diameter ladder portion A and the side rod 1 of the large diameter ladder portion B overlap, and the small diameter ladder portion A and the large diameter ladder portion B are attached. Combined with and will be completed at the same time.

Although two small-diameter ladder portions A and two large-diameter ladder portions B are provided in FIG. 2, the small-diameter ladder portions A and the large-diameter ladder portions B are inclined with respect to the vertical ladder portion 10 of the work ladder R. As long as the length of the ladder portion 20 can be adjusted, the number and location of the small-diameter ladder portion A and the large-diameter ladder portion B in the work ladder R are not particularly limited. The length adjustment of the vertical ladder portion 10 and the inclined ladder portion 20 of the work ladder R is not limited to the above example, and the length adjustment may be performed by any method. For example, the length may be adjusted by adding or subtracting a ladder of the same shape to the vertical ladder portion 10 or the inclined ladder portion 20.

The angle of the inclined ladder portion 20 integrally fixed to the vertical ladder portion 10 by welding or the like is set to about 20 to 30 degrees with respect to the horizontal considering the general angle of the roof, for example. be able to. Further, the inclined ladder portion 20 may be attached to the vertical ladder portion 10 so that the inclination angle can be adjusted. With reference to FIG. 5, an example in which the inclined ladder portion 20 is attached to the vertical ladder portion 10 so that the inclination angle can be adjusted will be described. A joint piece 1b is provided so as to project from the upper ends of the pair of side rods 1 and 1 of the vertical ladder portion 10, and the joint piece 1b is sandwiched between the base ends of the pair of side rods 1 and 1 of the tilted ladder portion 20 respectively. A joint piece 1c is provided, and both joint pieces 1b and 1c are rotatably connected by a joint pin 1d. As a result, the inclined ladder portion 20 can be rotated in the vertical direction with respect to the vertical ladder portion 10. The means for fixing the inclined ladder portion 20 rotatable in the vertical direction at a constant inclination angle is provided by the angle fixing rod 4, the adjusting long hole 4a provided in the angle fixing rod 4 and the inclination ladder portion 20. It is composed of a plurality of angle fixing holes 20a and a fixing screw 5. The angle fixing rods 4 are rotatably attached to the side rods 1 and 1 of the vertical ladder portion 10 by pairs 4 and 4 by pins 4b. By rotating the inclined ladder portion 20 up and down, one of the angle fixing holes 20a is aligned with the adjusting long hole 4a of the angle fixing rod 4, and the fixing screw 5 consisting of a bolt and nut is attached to the angle fixing hole 20a and the adjusting screw. Pass it through the long hole 4a and fix it with screws. As a result, the inclination angle of the inclined ladder portion 20 is fixed to a constant value. When changing the inclination angle, another angle fixing hole 20a may be used. The plurality of angle fixing holes 20a are provided in advance corresponding to the inclination angles of the tilted ladder portion 20, for example, 20 degrees, 30 degrees, 40 degrees with respect to the horizontal, and the predetermined angle corresponding to each angle fixing hole 20a. The tilt angle can be obtained.

The method and means for adjusting the inclination angle of the inclination angle portion 20 with respect to the vertical ladder portion 10 are not limited to the above examples. In short, if the inclined ladder portion 20 can change its inclination angle while maintaining the ladder shape with respect to the vertical ladder portion 10 and can be held in a firm state at the changed angular position, the method and means thereof can be used. Is not limited.

[0017]

[Effect of the invention]

 The present invention has the above-described structure and operation, and according to the work ladder of claim 1, a work including a pair of side rods made of metal pipes and a plurality of metal step rods arranged between them. A ladder, which is a vertical ladder standing vertically from the ground, an inclined ladder extending obliquely upward from the tip of the vertical ladder, and a roof provided on the tip of the inclined ladder. Since there is a bent part that comes into contact with the ridge part so as to be rolled up from above and plays a role of retaining, and a hook for attaching a safety tool provided near the tip of the ladder, the work ladder made of metal pipe is The vertical ladder can be set up on the ground, etc., and the bent part of the tip can be brought into contact with the ridge of the roof, so that the inclined ladder can be placed slightly above the inclined surface of the roof. Therefore, the worker can climb the vertical ladder and perform roofing work such as cleaning and cleaning the roof glass without burdening the roof on the roof with the sloped ladder. By moving the work ladder little by little in the longitudinal direction of the roof and repeating the work, the work of the entire roof can be performed. The pair of side rods can be made light and strong by using metal pipes. In addition, by installing a hook for attaching safety equipment near the tip of the ladder, it is possible to attach a lifeline or prevent the ladder from being removed from the ridge of the roof by a rope. Since the bent portion at the tip of the inclined ladder contacts the roof ridge so as to be rolled up, it prevents the work ladder from coming off and prevents the work ladder from falling off the roof during work. Also, when the work ladder is moved in the longitudinal direction of the roof, it is possible to prevent the work ladder from coming off the roof significantly by the bent part being properly hooked on the ridge of the roof. Can be moved easily without losing balance. According to the work ladder described in claim 2, in addition to the effect of the configuration described in claim 1, since the vertical ladder part and the inclined ladder part each have adjustable lengths, a building such as a greenhouse is constructed. The length of the vertical ladder and the inclined ladder can be adjusted according to the height to the roof of the building and the slope length of the roof, and the roof work can be performed as an appropriate work ladder according to the size of the building. You can Further, according to the work ladder of claim 3, in addition to the effect of the configuration of claim 1 or 2, the tilted ladder part extending obliquely upward from the tip of the vertical ladder part adjusts its tilt angle. Since it is possible, it is possible to reliably obtain an appropriate angle of the inclined ladder according to the inclination of the roof, and it is possible to facilitate roofing work on the inclined ladder.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a state where a work ladder of the present invention is arranged with respect to a greenhouse.

FIG. 2 shows an embodiment of a work ladder of the present invention, (A) is a side view of the work ladder, and (B) is a front view thereof.

FIG. 3 is a detailed view of a lower end portion of the work ladder that comes into contact with the ground.

FIG. 4 is a detailed view illustrating an example of a mechanism for adjusting the length of the work ladder, (A) is a front view, and (B) is a side view.

FIG. 5 is a detailed view illustrating an example of a mechanism for adjusting the angle of the work ladder.

[Explanation of symbols]

R Work ladder 1 Side rod 2 Step rod 3 Hook 10 Vertical ladder portion 20 Inclined ladder portion 30 Bent portion A Small diameter ladder portion B Large diameter ladder portion G Greenhouse G ₁ Ridge portion

Claims (3)

[Utility model registration claims] 1. A work ladder consisting of a pair of side rods made of metal pipe and a large number of metal step rods arranged between the side rods, the vertical ladder being erected vertically from the ground. An inclined ladder portion that extends obliquely upward from the tip of the vertical ladder portion, and a bend that is provided at the tip of the inclined ladder portion and that abuts against the ridge portion of the roof so as to be rolled in from above and acts as a stopper. A work ladder having a portion and a hook for attaching a safety tool provided near the tip of the ladder. 2. The work ladder according to claim 1, wherein the vertical ladder portion and the inclined ladder portion are adjustable in length. 3. The work ladder according to claim 1, wherein the inclined ladder portion extending obliquely upward from the tip of the vertical ladder portion has an adjustable inclination angle.