JPH03217590A - Stay for ladder - Google Patents

Abstract

PURPOSE:To promote safety with a simple construction by bearing either the middle one or one unit constituted of two on both sides among three connection levers capable of expansion on a working lever so that it is capable of controlling angles. CONSTITUTION:Three connection levers 2-4 capable of expansion are arranged to a working lever 1 with stable balance. After that, either middle one 3 or one unit constituted of two levers 2 and 4 on both sides among the connection lever 2-4 is born on a working lever 1 so that it is capable of controlling angles. A position of the top of an isosceles triangle or a reverse isosceles triangle binding each end of the connection levers 2-4 is capable of changing properly. In addition, temporary connections 21, 31 and 41 formed on the ends of the connection levers 2-4 are respectively connected temporarily to cross rails L1 and L1 of a ladder L.

Description

[Detailed Description of the Invention] (Object of the Invention) The present invention relates to a stay for a ladder that is necessary when a ladder needs to be suspended from a wall of a building or other supporting structure. The purpose of the present invention is to provide a ladder stay with a new structure that is easy and reliable to install and can be freely applied to different types of ladders. (Prior art) Various architectural works such as pasting wallpaper on the walls of buildings, especially walls around stairs, replacing ceiling lighting fixtures near walls, installing various decorative items on walls, etc. Work that can only be done by leaning a ladder against a support structure, such as painting high places or signboards, pasting up posters, or decorating high places near walls in stores, can be done all over the place. It can be seen. The way to hang a ladder in these situations is to place the lower end of the ladder on the ground or the floor, and have the upper end supported directly by the appropriate support structure 312. When viewed from the side, the ladder looks like a triangle with the hypotenuse. As a result, at the top of the ladder, the space between the ladder and the support ellipse becomes narrower, making it extremely difficult to work in that area.

Therefore, when it is necessary to work on such a wide area, using a ladder is inefficient and dangerous as described above, so it is necessary to erect scaffolding as appropriate. We had no choice but to make full-fledged preparations for the work, but depending on the nature of the work, it may be uneconomical to set up scaffolding, so it is desirable to use the simplest equipment possible. In places where it is too narrow to set up scaffolding, it is necessary to use equipment that does not take up much space, such as ladders. Therefore, for example, if we look at the methods used to date for work at high places around stairs where it is difficult to set up scaffolding, we find that it is certainly work using a ladder, with the bottom end of a long ladder supported by the stair tread. , When working near the top of a ladder where the top end is in contact with the wall surrounding the stairs and the distance between it and the support wall is narrow, the worker must push the support wall with his/her hand to lift the top of the ladder off the support wall. By doing this, we can see that the work is being done in a way that widens the gap with the supporting wall as much as possible. This invention focused on the above-mentioned method of using ladders, and as a result of research and development of a simple device that allows the top end of the ladder to be lifted off the wall and placed against a support wall, the company has finally succeeded in putting it into practical use. It is something. (Structure of the Invention) As can be clearly understood from the representative embodiments shown in the drawings, the ladder stay of the present invention has a working rod 1 and is arranged and supported in a well-balanced manner with respect to the working rod 1. Three telescopic connecting rods 2.3, 4. It consists of connecting rods 2, 3.
Either the center rod 3 in 4 or a set of two rods 2.4 at both ends, that is, either the connecting rod 3 or the connecting rods 2 and 4, is supported by the working rod 1 so that the angle can be adjusted freely. By doing this, the positions of the apexes of the isosceles triangle or the inverted isosceles triangle formed by connecting the tips of the three connecting rods 2, 3.4 can be changed as appropriate, and each connecting rod 2. ，
At the tips of 3 and 4, there are temporary attachment parts 21 and 31 to the ladder horizontal rung L1.
．． This is a stay for a ladder in which 41 is formed. The working rod 1 is made of a relatively lightweight material such as aluminum or plastic and has a rubber plate or other backing material 13 attached to the surface that comes into contact with the support wall, and is made of a relatively lightweight material such as aluminum or plastic. In order to stably support L, the ladder is formed in advance so that the length is larger than the width, or it is formed into a structure that allows the length to be changed as shown in the embodiment described later. Each of the connecting rods 2, 3.4 has one end fixed or pivotally connected to the working rod 1, and is made of a relatively lightweight member similar to the working rod 1. Each connection rod 2, 3 for the working rod 1
．． As shown in the example, the connecting rod 2.4 located on both sides of the three connecting rods 2, 3.4 is fixed, and the connecting rod 3 in the middle is arranged in the vertical direction. In addition to forming a rotatable pivot abutment, the middle connecting rod 3 is fixed and the connecting rods 2 and 4 on both sides can be rotated in the vertical direction, although it is not shown in the figure. It is also possible to form it as a flexible pivot structure. In the connecting rods 2, 3.4 connected to the working rod 1 in this way,
At least the connecting rod 3 or 2, 4 that is rotatably connected, that is, the connecting rod 3 in the embodiment shown,
Although not shown in the drawings, in the latter of the above examples, the connecting rods 2 and 4 are extendable horizontally,
For example, it is formed into a structure incorporating a screw-fastening structure using a locking screw 32, a spigot structure, or other known fixed ellipsoids that can stop its elasticity at an appropriate length. Also, at the tip of each connecting rod 2, 3.4, there is a horizontal bar L of the ladder L.
Temporary attachment parts 21, 31, 41 which can be connected and fixed to the connecting rod 3<< or 2.
4) by moving up and down as appropriate, these temporary attachment parts 2
1, 31.41 forms an isosceles triangle. It should be noted that among the connecting rods 2, 3.4, the connecting rod 2.4 or 3 that is connected to the working rod 1 by a fixed head (i.e., in the illustrated embodiment, the connecting rod 2, 4, and in the example not shown but belonging to the present invention, if even the connecting rod 3 is formed to have a telescopic structure similar to the connecting rod described above, the upper end of the ladder The separation distance from the supporting wall surface can also be adjusted to a desired separation distance, but the connection rod 3 (or 2
．． In the case where only 4) has a telescopic structure, the separation distance from the support wall surface W cannot be changed, and only the angle with respect to the support wall surface W can be changed. The examples shown in Figures 1 to 3 are based on this example, and in the figure, 22.42
indicates a set screw to control its elasticity. In the following, the ladder stay of the present invention will be explained in more detail based on the embodiment shown in the drawings. (Example 1) This example is one of the specific examples characterized by the action rod. That is, as shown in the overall perspective view of FIG. 1 showing the state of use, FIG. 2 is a plan view of the same, and FIG. This is an example in which the ladder L can be formed freely, and is particularly advantageous when it is necessary to hang the ladder L at a considerable distance from the supporting wall surface W, in order to ensure its stability, and also to facilitate storage and loading. The aim is to realize a ladder stay that is useful for compactness when carrying out work, and the length of both ends of the working rod 1 can be adjusted to the left and right by inserting, screwing, folding, etc. Assume that it is formed as follows. In the illustrated example, slide portions 11 and 11 are provided at both ends of the working rod 1.
is provided and pulled out to an appropriate length as shown by the broken line in FIG.

(Example 2) The following example is one in which the connecting rods 2, 3.4 are connected to a ladder and fixed, and the ladder is connected to a certain extent to make it possible to change the separation distance from the supporting wall surface W at the upper end. Here are two examples. That is, the action rod 1 is divided and formed into a main action rod 1' and a side effect rod 1'' which are parallel to each other in the front and back, and the main action rod 1' supports the three connecting rods 2.3.4, while the side effect rod 1' supports the three connection rods 2.3.4. This is a stay for a ladder in which the rod 1'' is formed so as to be freely protruded forward from the main working rod 1'. It goes without saying that the protruding ellipse of the side effect rod 1'' may be of a so-called pantograph type protruding structure as shown in the embodiment described later, or may be of a hydraulic type or other known jack structure as appropriate. As a means for changing the separation distance from the supporting wall surface W, as shown in this embodiment, the working rod 1 is divided into a main working rod 1' and a side effect rod 1'', and these working rods 1'
In addition to realizing this by changing the spacing of . Example 3) This example is not adopted in the embodiments shown in FIGS. 4 and 5, but is an example corresponding to Example 1 of the above-mentioned Example 2, and has a main action rod 1' and a side effect rod 1. This is a stay for a ladder, in which both ends of a side-effect rod 1'' are formed as slide parts in a working rod 1 divided and formed into two parts, so that it can be expanded and contracted from side to side.In this example, The telescopic structure can also be formed by various telescopic elliptical structures, similar to the first embodiment described above.

(Example 4) This example is one of the specific examples of the protruding structure of Example 2, and includes a plan view in FIG. 4 and a plan view in FIGS.
Embodiment 2, as shown in the sectional view, in which the protruding ellipse of the side-effect rod 1'' is realized from the combination of a threaded rod 15 and a crank piece 16, 16 interlocked with the handle 14. This is a stay for a ladder made of an oval. The screw rod 15 is formed into an oval with a reverse thread cut in half from the center, and one end side of each of a pair of crank pieces 16 and 16 is screwed together to rotate the handle 14. By rotating the screw rod 15 in this manner, the inclination angle of each crank piece 16.16 is changed, and as a result, the side effect rod 1'', which pivots the other end side of the crank piece 16.16, can freely protrude as appropriate. It was designed so that (Operation and Effect) The ladder stay of this invention, which is composed of the above-described oval structure,
Separately from ladder L, connect the connecting rods 2, 3.4 to the work site.
At the same time, a connecting rod that can be rotated (in the illustrated embodiment, connecting rod 3 located in the center) is attached to a connecting rod that cannot be rotated (connecting rods 2 and 4 on both sides in the embodiment), and As shown in example 1, slide parts 11.11 on both ends
In the case of a working rod 1 that can be freely expanded and contracted to the left and right, it is carried in its most compact state, and the work content, such as pasting wallpaper or displaying posters, etc., is carried on the wall. When performing installation work at a high place, when installing lighting fixtures and other various equipment in a protruding manner at the top of the wall, or when maintaining lighting fixtures buried in the ceiling relatively close to the wall. For the first time, the connecting rods 2.3.4 are fixed to the horizontal rungs Ll, Ll at the upper end of the ladder L using the temporary attachment parts 21.31.41 of the connecting rods 2.3.4. As can be understood from FIGS. 1 and 3, this attachment to the ladder is carried out using a connecting rod in which the connecting rods 2.4 and 3 are rotatably formed in a triangular side shape. (In the example, the connecting rod 3 in the center) is opened at an appropriate angle, and in particular, the connecting rods located above (in the illustrated example, the connecting rods 2 and 4 located on both sides) However, the supporting wall surface W
In order to realize a triangle (see Figure 3) that is approximately perpendicular to the Connection rod 3
If only the connecting rods 2 and 4 on both sides have a telescoping structure, adjust the lengths of these retractable connecting rods as appropriate. After being attached to the upper end of the ladder L in this way, as shown in Embodiment 1 or Embodiment 3, slide parts 11
．． 11, stretch both or one of them to an appropriate length, identify the length with the set screw 12, and then gently place the backing material 13 side of the working rod 1 of this stay against the supporting wall surface W. If the ladder comes into contact with the support wall W, the ladder L will be supported in a state where it appears to be floating on the supporting wall surface W, as seen in the state of use shown in FIG. In this state, if the sliding parts 11, 11 are arranged side by side as an action rod 1 (or a side effect rod 1''), the stability of the ladder L in a floating state can be increased, making work safer. On the other hand, as shown in Example 2, although a configuration is adopted in which the separation distance of the side effect rod 1'' from the main action rod 1' can be changed, In such cases, the ladder L may be placed from the support wall W in advance, or depending on the construction used, after the worker has climbed the ladder L, depending on the type of work the worker is doing. This adjusts the separation distance between the two and enables more efficient work.Especially, as shown in Example 4, in the case of a stay realized with a simple pantograph structure, the latter While climbing the ladder and working, the worker himself/herself can directly touch the handle 1.
4 and uses a crank to adjust and secure the separation distance from the supporting wall surface W, making it extremely superior not only in terms of operability but also in terms of safety. ．． As mentioned above, the ladder stay of this invention has a relatively simple structure, can be easily stored using the horizontal rung of a ladder, and is safe to use. It is extremely effective for pasting wallpaper on high places on walls, various types of work on signboards and other vertical structures, installing lighting fixtures on ceiling surfaces near walls, and other maintenance, and is also compact in overall shape. Because it can be used as a work tool, it is convenient to carry around as a working tool, and it is also advantageous in terms of storage management and distribution as a product.

[Brief explanation of drawings]

The drawings are based on representative embodiments of the present invention, and FIG. 1 is a perspective view showing the state of use, FIG. 2 is a plan view, FIG. 3 is a cross-sectional view from A to A, and FIG. is a plan view of another embodiment, and FIG. 5 is a sectional view taken along line B-B.

Claims (1)

[Scope of Claims] 1 Consists of a working rod and three telescopic connecting rods arranged and supported in a well-balanced manner with respect to the working rod, one in the center of the connecting rods, or two at both ends. By supporting any one of the set on the working rod so that the angle can be adjusted freely, the position of the apex of the isosceles triangle or inverted isosceles triangle formed by connecting the tips of the three connecting rods can be changed as appropriate. The stay for a ladder is formed such that the stay is formed so that the stay is formed so that the stay is formed as shown in FIG. 2. The stay for a ladder according to claim 1, wherein the working rod is formed so that both ends thereof can be expanded and contracted left and right. 3 The action rod is divided and formed into a main action rod and a side effect rod that are parallel to each other in the front and back, and the main action rod supports the three connecting rods, while the side effect rod can be pushed forward from the main action rod as appropriate. A stay for a ladder according to claim 1, which is formed by forming a stay for a ladder. 4. A stay for a ladder according to claim 3, in which the action rod is divided and formed into a main action rod and a side effect rod, and both ends of the side effect rod are formed so as to be expandable and contractible to the left and right. . 5. The stay for a ladder according to claim 3, wherein the protruding structure of the rod is composed of a combination of a threaded rod and a crank piece interlocked with the handle.