JP3067790U - Double ladder device available independently - Google Patents

Abstract

(57) [Summary] (Modified) [Problem] To provide a support means for a double ladder that can stand alone. A connecting rod (12) is attached to a horizontal rail at the upper end of a main ladder (A) of a double ladder, and a pair of auxiliary legs (4, 5) crossing each other.
And three auxiliary ropes 9, 10, 11
Secure the main ladder legs and auxiliary legs. Movable ladder B
Is supported by another auxiliary leg 6, whereby a double ladder that can be used independently can be obtained. Any of the auxiliary legs can be extended and retracted, and can be used regardless of the unevenness of the installation surface.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 This device was originally devised so that a portable double ladder that was originally used by hanging it against fences, beams, and roof eaves could be used independently. .

[0002]

[Prior art]

 The types of ladders that can be used independently include stepladders and three-ladder ladders, but these two types are difficult to use because of their limited height due to structural and manufacturing difficulties. Appropriate. Also, ladders with auxiliary legs etc. have been devised.However, there are difficulties in the attachment of the auxiliary legs to make them independent, and this method requires a large-sized stepladder or three ladders. However, it is not suitable because it is limited to use at a height that does not change much (approximately 4 m at the very height). At present, work benches equipped with small work vehicles have become widespread, and those with work heights exceeding 10 meters have been developed. However, the use of a workbench requires the width and steepness of a work vehicle and a solid ground, and it is impossible to use the workbench in places that do not meet these conditions. In orchards, the ground is soft and the roots and branches of the ground, which are important for fruit trees, are easily damaged. Therefore, it is impossible to use them except for a small part of the roadside.

[0003]

[Issues to be solved by the invention]

 Compare this with a stepladder, three ladders, and a ladder with auxiliary legs that have been developed in the past, to develop a device that incorporates the advantages of a double ladder to enable safer work at a higher position. It is assumed that.

[0004]

[Means for Solving the Problems]

 The basic idea of this independently-available double ladder device is that one of the properties of the triangle is that the shape is determined when three sides are determined. It is an application of the principle. (1) In a double ladder device which can be used independently consisting of the following (a) to (c): (a) A connecting rod 12 is connected to the upper step 3 of the main ladder A of the double ladder. Two extendable and retractable auxiliary legs 4.5 are connected to the bolt ab of the connecting rod 12, and the auxiliary legs 4.5 are crossed by bolts M to form a double ladder. (B) The main legs 1.1 and the auxiliary legs 4.5 of the main ladder A of the double ladder are connected by three auxiliary ropes 910 and 11. (C) While extending the movable ladder B of the double ladder upward, attach the extendable auxiliary leg 6 to the upper step 3. This is a dual ladder device which is configured as described above and can be used independently. 2. The nine triangles formed by the main ladder A, the movable ladder B, the connecting rod 12, the three auxiliary legs 4,5,6, the extension adjustment leg 7, and the three auxiliary ropes 9,10,11 are as described above. By fixing the double ladder, it becomes a dual ladder device that can be used independently. The dual ladder device that can be used independently has the following contents (a) to (ii). (B) The connecting rod 12 is passed through the hollow portion of the step 3 on the upper stage of the main ladder A of the double ladder, and is mounted so that the connecting rod 12 can rotate. (B) If the step 3 has no hollow portion, the connecting rod 12 is passed through another pipe and attached to the outside of the step 3 so that the connecting rod 12 can be rotated. (C) The two auxiliary legs 4 and 5 are crossed with a bolt M and fixed. (D) The two crossed auxiliary legs 4 and 5 are connected to the bolt ab of the connecting rod 12. (E) Raise the double ladder with the connection completed. (F) Stabilize the double ladder by adjusting the expansion / contraction leg 7 in accordance with the gradient of the double ladder and the level difference or unevenness of the ground contact surface. (G) The main ladder main leg 1.1 of the double ladder and the two auxiliary legs 4.5 are connected by crossing the two auxiliary ropes 9 and 10. (H) The two auxiliary legs 4 and 5 are connected by one auxiliary rope 11. (I) The step ladder 3 at the upper stage of the movable ladder B of the double ladder is mounted so as to be supported by the device n above the auxiliary leg 6. (V) While the movable ladder B is extended upward, the auxiliary leg 6 is simultaneously extended by operating the telescopic adjustment leg 7 so that the overlap between the main ladder A and the movable ladder B step 3 is adjusted to a height of about five steps. And complete the installation. (L) Adjust the overlap of the step 3 according to the content of the work, and adjust the height of the entire double ladder. (Iii) The three auxiliary legs 4, 5, and 6 are made to expand and contract in relation to the expansion and contraction adjustment legs 7, so that they can be installed in any location regardless of the unevenness or steps on the installation surface. It is configured to be able to. The number of triangles formed by the above procedure is as follows. ΔMab, ΔMgh, ΔMkl, Δahj, Δale, Δbgi Δbkf, irregular Δnm (ef), irregular Δ (ab) (kl) (ef) Triangles, especially the irregularities △ (ab) (kl) (ef) and △ Mab, △ Mkl are important triangles for the present invention.

[0005]

【Example】

 1. In this proposal, a third model was first made based on the principle of the triangle and repeated experiments. After that, a double ladder (with a main ladder A and a movable ladder B overlapped, a total length of 4.2 m and a movable ladder B As a result of an experiment using a metal laundry bar (total length of 4 m) as an auxiliary leg, it was possible to use the laundry bar (total length of about 7 m when extended) to a height of about 6 m above the ground at the height of the worker's head. And that it was possible to climb. Based on the above, if the auxiliary legs are made of the same aluminum square bar as the double ladder (pipe may be used if it is strong) and the connecting parts are also made of metal, the height is about 6.5 m above the ground. Work can be performed safely. 2. The tools and structure of the present invention are as follows. (B) The double ladder is composed of a pair of the main ladder A and the movable ladder B, and is double the main ladder A using a tool (a rope) that slides the movable ladder B above the main ladder A. A ladder that can be extended and used. (B) The main ladder A and the movable ladder B are composed of a main ladder main leg 1, a movable ladder main leg 2, and a step 3, respectively. (C) The auxiliary legs 4, 5, and 6 are auxiliary legs for making the double ladder independent. (D) The connecting rod 12 is a rod connecting the main ladder A and the auxiliary legs 4 and 5. (E) The bolt ab is a wing nut and a bolt for connecting the connecting rod 12 and the auxiliary legs 4.5. (F) The telescopic adjustment legs 7 are legs that can be put in and out of the auxiliary legs 4, 5, and 6, and adjust the overall length of each auxiliary leg. (G) The slip stopper 8 is mounted so that it can slide toward the telescopic adjustment leg 7, and when the overall length of each auxiliary leg is determined, it is fixed to the telescopic adjustment leg 7 with a thumbscrew. Brackets 5 and 6 are used to stop the device from slipping downward. (This makes it possible to finely adjust the length of the entire auxiliary leg.) (H) The stopper 13 is a wing nut for preventing the connecting rod 12 from coming off the upper step 3 of the main ladder A. And bolts. (I) Stoppers M are wing nuts and bolts for fixing the auxiliary legs 4 and 5 crosswise. (V) The support member n is a U-shaped device of the auxiliary leg 6 for supporting the upper step 3 of the movable ladder B. (V) The latch 14 is a latch with a spring attached to both ends of the auxiliary ropes 9, 10, and 11. (ヲ) The hanging ring ghiij is a ring attached to the main ladder main leg 1 and the auxiliary legs 4.5, and is used to hang the latch 14 of the auxiliary ropes 9, 10, and 11. (W) cd is both ends of the upper step 3 of the movable ladder B. (F) ef is a ground contact point of the main ladder main leg 1. (Y) klm is a contact point of the telescopic adjustment leg 7. 3. The tool of the present invention can be assembled and installed by the following procedure by two adults. (A) The main ladder A and the movable ladder B of the double ladder are overlapped. (B) The two auxiliary legs 4 and 5 intersect at M and are fixed with the stopper M. (C) The two auxiliary legs 4 and 5 are placed on the lower side, and the two ladders are placed on top of each other. (D) The ab of the connecting rod 12 and the two auxiliary legs 4.5 are connected to the hollow of the upper step of the main ladder A of the double ladder. (E) One person holds the ground contact (ef) of the double ladder with his / her foot without slipping, and another person lifts the upper part of the double ladder. (F) The person holding the ground contact extends his arm, puts his hand on the step of the ladder, and cooperates in setting up a double ladder. (G) The person who lifted the double ladder pulls the grounding portions (kl) of the two auxiliary legs 4 and 5 toward the user, and stands the double ladder diagonally. (H) The main ladder A of the double ladder and the two auxiliary legs 4 and 5 are crossed and connected like two connecting lines gi and hj. (I) The two auxiliary legs 4 and 5 are connected by one connecting line gh. (U) The two-piece ladder is fixed independently with the three connecting ropes stretched. (L) Set so that the person who lifts the upper part of the ladder supports the upper step of the movable ladder B with the support of the auxiliary leg 6. (ヲ) While extending the movable ladder B upward, the auxiliary leg 6 is simultaneously extended by operating the telescopic adjustment leg 7 to complete the installation. In the case of work at a height of about 6.5 m above the ground, adjust the overlap of the step 3 of the main ladder A and the movable ladder B to five steps. 3. Regarding the movement of the double ladder, if it is within the range of 4 to 5 m on level ground, even if the movable ladder B is extended upward, just loosen the three connecting ropes 8, 9, and 10 slightly. Two people can move easily. In the case of exceeding that, the movable ladder B is returned to the main ladder A once and then moved. In the case of moving far away by car or the like, after removing the auxiliary legs 6, the auxiliary legs 4 and 5 are removed from the auxiliary rod 12 and transported.

[0006]

[Effect of the invention]

 1. As mentioned above, this project requires two adults to install, but after installation, it can completely stop the vertical slip and side slip, which are the drawbacks of the ladder, so there is no need for an assistant to hold the ladder and it is safe Work can proceed. 2. In the dual ladder of the present invention, after removing the three auxiliary ropes 9, 10, and 11, the telescopic adjustment legs 7 of the two auxiliary legs 4, 5 are respectively returned into the auxiliary legs, and the two auxiliary legs 4, 5, By unscrewing the thumbscrew connecting the and the auxiliary rod 12 and separating the two ladders from the two auxiliary legs 4 and 5, the double ladder returns to the normal state (but with the auxiliary rod 12 attached). Very convenient for storage and transportation. In this state, it can be used as an ordinary double ladder. 3. This independently available double ladder, if made of neat material, can work within a height of about 6.5m. In the following, the method of using this independent ladder is listed. (B) This double ladder can be set up at the required position independently with various operations of fruit trees, so that the fruit tree can be cut, picked and harvested up to 6.5 m in length (especially when it is damaged). Suitable for the work of fruits). (B) Spraying chemicals on fruit trees, garden trees, etc. is optimal for this task because spraying from a high distance from the trees is more efficient and less harmful to the human body. (C) It can also be used for tree care, pruning, snow fencing, etc. that cannot be reached with ordinary gardening ladders (three main ladders). (D) It is also suitable for work inside tall greenhouses such as cherries. (E) If there is an object to lean against, use two auxiliary legs 4.5 and three auxiliary ropes 8, 9, and 10, so that there is no need to worry about the side slip at the top of the ladder or the vertical slip at the ground of the ladder. However, even when using a double ladder, it is not necessary to have an assistant to hold the ladder. (F) The snow stakes that are famous for Kenrokuen are currently used for famous gardens and private garden trees in various places. By using a series of ladders, the work content and work efficiency can be improved. (G) Due to heavy snow this year, snow damage to pine branches in Hirosaki Park was reported. Pine trees are widely distributed in parks where cars cannot enter, so there seems to be no better way than relying on human power. It was good enough to be able to cope with a stepladder with three ladders with a pole, but it seemed that it was not possible to reach the most prominent 6-8 m branching area. In such a case, it seems that the problem could be solved to some extent by using a pole 4m from the 5m position of this independent ladder. Since this is likely to occur in snowy countries, we want to use this independent double ladder to protect our valuable cultural heritage. (H) Up to a height of about 3.5 m, the fire truck can withstand the firewater discharge and fire reaction, and by using this principle for the fire truck's carrying ladder, it is possible to reduce the risk of accidents such as accidents in a lane or accident. It can also be used for firefighting activities and rescue of places where fire trucks cannot enter for reasons. (I) Using the conventional double ladder, separately creating auxiliary legs, etc., and by combining them, it is possible to complete the “independently usable dual ladder device”, and thus the economic burden will be reduced. I need less.

[Brief description of the drawings]

FIG. 1 is a perspective view of the double ladder of the present invention.

FIG. 2 is a partially enlarged perspective view of the present invention.

FIG. 3 is a partially enlarged perspective view of the present invention.

FIG. 4 is a partially enlarged front view of the present invention.

FIG. 5 is a partially enlarged perspective view of the present invention.

[Explanation of symbols]

Reference Signs List A Main ladder B Movable ladder (ladder extending upward) 1 Main ladder main leg 2 Movable ladder main leg 3 Step rail 4 Auxiliary leg 5 Auxiliary leg 6 Auxiliary leg 7 Telescopic adjustment leg 8 Telescopic adjustment bracket (with thumb screw) 9 Auxiliary Rope 10 Auxiliary rope 11 Auxiliary rope 12 Connecting rod 13 Stopper (Thumb screw and bolt) 14 Hasp a, b Connection tool (Thumb screw and bolt) c, d Both ends of upper step of movable ladder B e, f Main ladder main landing gear 1 at the ground point M stop (thumb screw and bolts) _{M 1} regulation hole M ₂ adjusting holes g, h, i, j seat ring k, l, the ground point of m auxiliary leg 4 · 5 · 6 n supporter

Claims (2)

[Utility model registration claims] 1. An independently usable double ladder device comprising the following items (a) to (c): (a) a connecting rod 12 attached to the upper step 3 of the main ladder A of the double ladder;
Are connected to each other, and two auxiliary legs 4.5, which can be extended and contracted, are connected to the bolt ab of the connecting rod 12, and the auxiliary legs 4.5 are crossed by bolts M to form a double ladder. (B) Main legs 1.1 and auxiliary legs 4.5 of the main ladder A of the double ladder
Are connected by three auxiliary ropes 910 and 11. (C) While extending the movable ladder B of the double ladder upward, attach the extendable auxiliary leg 6 to the upper step 3. An independently usable dual ladder device configured as described above. 2. Nine triangles formed by a main ladder A, a movable ladder B, a connecting rod 12, three auxiliary legs 4,5,6, a telescopic adjustment leg 7, and three auxiliary ropes 9,10,11. Becomes a dual ladder device that fixes the above-mentioned dual ladder and can be used independently, and is configured as shown in the following (a) to (l). (A) The connecting rod 12 is passed through the hollow portion of the step 3 on the upper stage of the main ladder A of the double ladder so that the connecting rod 12 can be rotated. (B) If the step 3 has no hollow part, the connecting rod 12
Through a separate pipe so that the
Attach outside. (C) The two auxiliary legs 4 and 5 are crossed with a bolt M and fixed. (D) The two crossed auxiliary legs 4 and 5 are connected to the bolt ab of the connecting rod 12. (E) Raise the double ladder with the connection completed. (F) Adjusting the expansion / contraction leg 7 in accordance with the inclination of the double ladder and the level difference or unevenness of the ground contact surface, thereby stabilizing the double ladder. (G) Main ladder main leg 1.1 and two auxiliary legs 4.
5 is connected by crossing two auxiliary ropes 9 and 10. (H) The two auxiliary legs 4 and 5 are connected by one auxiliary rope 11. (I) The upper step 3 of the movable ladder B of the double ladder is attached to the auxiliary leg 6.
Attach it so that it is supported by the instrument n on the upper part. (V) While extending the movable ladder B upward, the auxiliary leg 6 is simultaneously extended by operating the telescopic adjustment leg 7 so that the overlap between the main ladder A and the step 3 of the movable ladder B is adjusted to a height of about 5 steps. To complete the installation. (L) Adjust the overlap of the step 3 according to the content of the work, and adjust the height of the entire double ladder.