KR100614911B1 - Multi-step ladder - Google Patents

Abstract

The present invention is a multi-stage high ladder, more specifically, each ladder to have an optimum shape according to the height to prevent the sag caused by the weight and the working load to the maximum, and also to have a structure that each ladder is reinforced Yet it relates to a multi-stage elevated ladder that can increase the bending strength in the longitudinal direction by minimizing its own weight.

To this end, the present invention is a multi-stage elevated ladder in which a plurality of ladders are mutually sliding overlapping to extend or contract, a main frame having a lower end bent inward at a right angle, ribs protruding from the side of the main frame, and between the ribs A plurality of side members formed integrally with a joint portion protruding from the side of the main frame so as to form a guide groove, and a reinforcement portion protruding on the side opposite to the side protruding the rib and the joint relative to the main frame A lower ladder configured to be connected to each other by horizontal members in contact with both sides of each joint; A flat mainframe, ribs protruding from the side of the mainframe, joints protruding from the side of the mainframe to form guide grooves between the ribs, the ribs with reference to the mainframe, and The plurality of side members formed by integrally forming a reinforcement portion protruding the coupling portion protruding on the side opposite to the protruding side of the joint is formed by a horizontal member in contact with both sides of each joint portion, An intermediate ladder having a coupling part slidingly coupled to the guide groove of the lower ladder in such a way as to overlap with the lower ladder; A plurality of side members formed of a plate-shaped main frame and a reinforcement part protruding from a side surface of the main frame and having an engaging portion protruding from the side are connected to each other by horizontal members in contact with both sides of each joint. An upper ladder coupled to the coupling unit so as to overlap with the intermediate ladder by sliding in the longitudinal direction to the guide groove of the intermediate ladder; Characterized in that configured to include.

Ladder, multi-stage, overlap, strength, load, deflection

Description

Multi-stage elevated ladder {Multi-Step Ladder}

1 is a front view showing the overlapping state of each ladder of the multi-stage elevated ladder according to the present invention,

Figure 2 is a perspective view showing a lower ladder in a multi-stage elevated ladder according to the present invention,

3 is a cross-sectional view showing a side member of FIG.

Figure 4 is a perspective view of the intermediate ladder in the multi-stage elevated ladder according to the present invention,

5 is a cross-sectional view showing a side member of FIG.

Figure 6 is a perspective view of the upper ladder in the multi-stage elevated ladder according to the present invention,

7 is a cross-sectional view showing the side member of FIG.

<Description of the symbols for the main parts of the drawings>

10,50,75: side members 11,51,73: mainframe

13,53: rib 14,54: guide groove

15,55: joint 17,57,77: reinforcement

19,59,79: Plate 20,60,76: Horizontal member

25,65,95: Guard structure 27,67,97: Upper frame

28,68,98: connecting rod 30: lower ladder

58,78: coupling part 70: intermediate ladder

80: upper ladder 90: pad

100: multi-stage elevated ladder

The present invention is a multi-stage high ladder, more specifically, each ladder to have an optimum shape according to the height to prevent the sag caused by the weight and the working load to the maximum, and also to have a structure that each ladder is reinforced Yet it relates to a multi-stage elevated ladder that can increase the bending strength in the longitudinal direction by minimizing its own weight.

In general, an elevated ladder is a means for easily moving or transporting a person or cargo between a high point and a low point, and is usually installed in a moving means such as a car, and a plurality of ladders may vary in volume depending on use. The ladder is formed by slidingly overlapping each other.

Since the elevated ladder takes the shape of the cantilever beam during use, the bending strength in the longitudinal direction must be large to ensure safe use.

In order to increase the strength of the expensive ladder, its shape and structure have to be optimized, but in the related art, there is a problem in that the length of the ladder is limited in consideration of strength due to insufficient research and development.

In addition, the conventional high ladder has a large amount of deflection due to its own weight and the applied working load, thereby causing anxiety in use, and in some cases, a specific part is damaged, resulting in loss of life and property.

The present invention has been made to solve the above problems, the object of the present invention is to ensure that each ladder has an optimal shape according to the height of the multi-stage high ladder that can prevent the sag caused by the weight and the working load to the maximum To provide.

In addition, another object of the present invention is to provide a multi-stage expensive ladder that can increase the bending strength in the longitudinal direction while minimizing its own weight while having each ladder having a reinforced structure.

The present invention for solving the above problems is a multi-stage elevated ladder in which a plurality of ladders are mutually sliding overlapping elongation or contraction, the main frame and the ribs projecting from the side of the main frame and the lower end is bent inward at right angles; And a joint part protruding from the side of the main frame to form a guide groove between the rib and a reinforcement part protruding on a side opposite to the side from which the rib and the joint part protrude from the main frame. A lower ladder configured to be connected to each other by a horizontal member in which a plurality of side members formed in contact with both sides are formed; A flat mainframe, ribs protruding from the side of the mainframe, joints protruding from the side of the mainframe to form guide grooves between the ribs, the ribs with reference to the mainframe, and The plurality of side members formed by integrally forming a reinforcement portion protruding the coupling portion protruding on the side opposite to the protruding side of the joint is formed by a horizontal member in contact with both sides of each joint portion, An intermediate ladder slidingly coupled to the guide groove of the lower ladder in a longitudinal direction, the intermediate ladder being overlapping with the lower ladder; a flat main frame and a protruding portion from the side of the main frame and protruding from the side of the main frame; A plurality of side members formed integrally with the reinforcement portion of each joint Both sides are in contact is made, interconnected by a cross member, the upper ladder engaging portion is coupled to the sliding grooves of the intermediate ladder in the longitudinal direction is coupled to overlap with the intermediate ladder; Characterized in that configured to include.

The present invention having such a feature will be more clearly described through the preferred embodiment accordingly.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description, the present invention belongs to the scope of the multi-stage elevated ladder in which a plurality of ladders are overlapped and stretched or contracted with each other, and for convenience, the ladders of the multi-stage are separated into upper ladders, middle ladders, and lower ladders. Therefore, the present invention can be applied to a multi-stage ladder rather than the embodiments to be described below, which also belongs to the scope of the present invention.

1 is a front view showing the overlapping state of each ladder of the multi-stage elevated ladder according to the invention, Figure 2 is a perspective view showing a lower ladder in the multi-stage elevated ladder according to the invention, Figure 3 is a side member of FIG. 4 is a perspective view showing an intermediate ladder in a multi-stage elevated ladder according to the present invention, FIG. 5 is a sectional view showing a side member of FIG. 4, and FIG. 6 is a top ladder in a multi-stage elevated ladder according to the present invention. 7 is a perspective view illustrating a side member of FIG. 6.

As shown, the multi-stage elevated ladder 100 according to the present invention is largely divided into a lower ladder 30, an intermediate ladder 70, and an upper ladder 80.

The lower ladder 30 includes a side member 10 and a horizontal member 20.

The side member 10 has a rib 13 and a joint 15 protruding from the side surface of the main frame 11 at which a lower end is bent inwardly at a right angle, and the main frame 11 based on the main frame 11. A reinforcing portion 17 is formed to protrude from the side opposite to the side from which the rib 13 and the joint portion 15 of 11) protrude. That is, the side member 10 is formed by the main frame 11, the rib 13, the joint 15, and the reinforcing portion 17 is formed integrally interconnected by a horizontal member 20 to be described later It consists of a plurality as much as possible.

Here, the lower end of the main frame 11 has a shape that is bent inward at a right angle to allow the ladder according to the present invention to be easily mounted on a moving means such as a vehicle.

In addition, the ribs 13 are formed on the upper side, the joint portion 15 is formed on the lower side, respectively, the rib 13 and the joint portion 15 are spaced apart from each other at regular intervals and the ribs 13 and An approximately square guide groove 14 is formed between the joints 15. At this time, the guide groove 14 is formed for coupling with the coupling portion 58 of the intermediate ladder 70 to be described later.

In addition, the reinforcing portion 17 of the side member 10 as described above is formed in the section forming the end of the rib and the main frame, a plurality of diaphragm 19 is formed therein, the diaphragm 19 is the A surface perpendicular to the main frame 11 of the rib 13 and the joint 15 is extended.

"와 같은 단면 현상을 갖게 된다. This side member 10 is based on the longitudinal direction "

It will have a cross-sectional phenomenon such as ".

The horizontal member 20 described above is to interconnect both side members 10 as described above, and serves as a scaffold when used. Here, looking at the configuration in which the side members 10 are connected by the horizontal member 20 in more detail, the horizontal member 20 is connected to the one side and the other side in contact with the joint 15 of the side members 10, respectively. do. In this case, the horizontal member 20 may be connected to the joints 15 by welding.

The intermediate ladder 70 also includes a side member 50 and a horizontal member 60.

Here, the side member 50 is composed of a plurality, each side member 50 is a rib-type 53 and the joint portion protruding from the side of the main frame 51 and the main frame 51 of each of the flat type 55 and a reinforcement part 57 protruding from the side of the main frame 51 opposite to the side from which the rib 53 and the joint part 55 protrude from the main frame 51. It is made of.

At this time, the guide groove 54 is formed between the rib 53 and the joint portion 55 of the side member 50 so that the coupling portion 68 of the upper ladder 80 to be described later can be coupled. That is, the rib 53 and the joint 55 are spaced apart from each other so as to form the guide groove 54.

In addition, the reinforcement portion 57 is formed in the section forming the end of the rib 53 and the joint portion 55, the outer surface for the coupling with the guide groove 14 of the lower ladder 30 described above Coupling portion 58 is formed to protrude.

"와 같은 단면 현상을 갖게 된다. In addition, a plurality of diaphragms 59 are formed in the reinforcement part 57 of the side member 50 as described above, and the diaphragm 59 is the main frame of the ribs 53 and the joint part 55. 51) extends perpendicular to the plane. Accordingly, the side member 50 is based on the longitudinal direction "

It will have a cross-sectional phenomenon such as ".

Such side members 50 are connected to each joint 55 by a horizontal member 60 which is connected to one side and the other side thereof. Here, the horizontal member 60 may be connected to the joints 55 by welding.

In addition, the coupling portion 58 of the reinforcement portion 57 has been described above is coupled to the guide groove 14 of the lower ladder (30). At this time, the coupling portion 58 is slidably coupled to the guide groove 14 of the lower ladder 30 in the longitudinal direction, thus, the lower ladder 30 and the intermediate ladder 70 so as to overlap Combined. Here, in order to induce sliding of the ladders (lower ladder, intermediate ladder), it is preferable that the pad 90 is interposed between the coupling part 58 and the main frame 51 of the lower ladder 30. .

The upper ladder 80 also includes a side member 75 and the horizontal member 76.

"의 단면 형상을 취한다. Here, the side member 75 is composed of a plurality, each side member 75 is protruded from the side and bottom of the main frame 73 and the main frame 73 of the flat type and the engaging portion 78 on the side ) Is formed by integrally forming a reinforcing portion 77 protruding. In addition, a plurality of diaphragms 79 are formed in the reinforcement part 77. This side member is based on the longitudinal direction "

Take the cross-sectional shape of ".

"의 형상을 갖는 것이 보강부(77)이며, 상기 보강부(77) 내부를 가로지르도록 형성된 것이 격판(79)이다.
이와 함께, 상기 보강부(77)의 측면(도 7을 기준하여 좌측)에 돌출 형성된 것이 결합부(78)이다.
또한, 상기와 같은 복수개의 측면부재(75)를 연결하는 것이 가로부재(76)인데, 상기 가로부재(76)는 상기 보강부(77) 중 결합부(78)가 형성된 측의 대향된 측에 접하게 된다.
예로서, 도 7을 기준하여, 상기 측면부재(75)의 메인프레임(73)을 중심으로 상기 보강부(77)의 결합부(78)에 대향된 측, 즉, 도면상 우측에는 가로부재(76)의 일측이 접하게 되는 것이다.Both sides of the horizontal member 76 are connected to the reinforcing portions 77 of the side members 75, respectively, so that the side members 75 may be integrally connected.
That is, protruding from the side and bottom of the main frame 73 in the above "

Is a reinforcement part 77, and a diaphragm 79 is formed to cross the inside of the reinforcement part 77.
In addition, the coupling portion 78 protrudes from the side surface (left side with reference to FIG. 7) of the reinforcement portion 77.
In addition, connecting the plurality of side members 75 as described above is a horizontal member 76, the horizontal member 76 on the opposite side of the side of the reinforcing portion 77, the coupling portion 78 is formed You will come across.
For example, with reference to FIG. 7, the side opposite to the coupling portion 78 of the reinforcement portion 77 around the main frame 73 of the side member 75, that is, the right side of the horizontal member ( One side of 76) will come into contact.

The upper ladder 80 as described above is coupled so as to overlap the intermediate ladder 70, which is possible by the coupling portion 78 is longitudinally coupled to the guide groove 54 of the intermediate ladder 70. .

Here, the pad 90 is preferably interposed between the coupling part 78 and the main frame 51 of the intermediate ladder 70 in order to induce sliding of each ladder (intermediate ladder, upper ladder). Here, the pad 90 is not limited to a specific material, and the pad 90 may be inducing slipping.

On the other hand, reference numerals 25, 65, 95, respectively indicate the guard structure (25, 65.95) configured in the lower ladder 30, the intermediate ladder 70 and the upper ladder 80, respectively.

Each guard structure 25, 65, 95 has an upper frame (27, 67, 97) and the upper frame located on the upper side of the side members (10, 50, 75) of each ladder (30, 70, 80) (27,67,97) and the connecting rod (28,68,98) for connecting the side members (10,50,75). Such guard structures 25, 65, and 95 function to protect the user from falling during use.

As described above, according to the present invention, it can be seen that the side members 10, 50, 75 of the upper ladder 80, the intermediate ladder 70 and the lower ladder 30 have different cross sections.

"의 형상을 취한다. That is, the side member 10 of the lower ladder 30 has a relatively large height "

Take the shape of ".

"의 형상을 취한다. In addition, the side member 50 of the intermediate ladder 70 has a shape in which the lower portion of the lower ladder 30 is omitted.

Take the shape of ".

"의 형상을 갖는다. In addition, the side member 75 of the upper ladder 80 has a shape in which the rib 53 and the joint part 55 are omitted in comparison with the side member 50 of the lower ladder 30 and the intermediate ladder 70. sign "

Has the shape of ".

As described above, the differentiated shapes of the side members 10, 50, and 75 of the ladders 30, 70, and 80 allow each of the ladders 30, 70, and 80 to achieve a more structurally stable coupling. That is, in view of the distinctive shape of the side members 10, 50, 75, the ladder located above the ladders 30, 70, 80 has a structure for basic strength but is relatively simple as it is simplified. It has a small weight. Accordingly, the ladders 30, 70, and 80 are minimized in displacement, i.e., the amount of deflection due to their own weight and working load, and the total load is evenly distributed to the ladders 30, 70, and 80.

Meanwhile, according to the present invention, the sections in which the guide grooves 14 and 54 for the lower ladders 30 and the intermediate ladders 70 are formed are completely reinforced by the reinforcing parts 17 and 57, and the ladders 30 and 70 respectively. In the side members (10, 50, 75) of the 80, a plurality of diaphragm (19, 59, 79) is formed inside the reinforcement (17, 57, 77) to increase the bending strength in the longitudinal direction.

In addition, the ribs 13 and 53 formed on the lower ladder 30 and the intermediate ladder 70 have the shape of a right triangle in cross section, due to the shape of the ribs 13 and 53, the multi-stage elevated ladder according to the present invention. 100, the bending strength is increased while minimizing its own weight.

As described above, the present invention has the effect that each ladder has an optimal shape according to the height to prevent the phenomenon of sag due to the self-weight and the working load to the maximum.

In addition, the present invention has an effect that can increase the bending strength in the longitudinal direction by minimizing the weight while having each ladder has a reinforced structure.

Claims (5)

In the multi-stage expensive ladder in which a plurality of ladders are mutually sliding overlap and stretch or contract, The main frame 11 has a lower end portion bent inward at right angles, a rib 13 protruding from the side surface of the main frame 11, and a guide groove 14 between the rib 13. Joint portion 15 protruding from the side of the (11), and the reinforcement portion 17 protruding on the side opposite to the side from which the rib 13 and the joint portion 15 protrude from the main frame 11 A lower ladder (30) formed by connecting a plurality of side members (10) formed integrally with each other by horizontal members (20) in which both sides contact each joint (15); The main frame 51 of the main frame 51 to form a guide groove 54 between the flat main frame 51, the rib 53 protruding from the side of the main frame 51, and the rib 53 The joint part 55 protruding from the side surface and the rib 53 and the joint part 55 protruding from the side opposite to the protruding side with respect to the main frame 51 and the coupling part 58 at the side thereof. A plurality of side members 50 formed by integrally formed reinforcement portion 57 protruded are connected to each other by a horizontal member 60 in contact with each side of the joint portion 55, the coupling portion ( An intermediate ladder (70) slidingly coupled to the guide groove (14) of the lower ladder (30) in such a way as to overlap the lower ladder (30); A plurality of side members formed of a plate-shaped main frame 73 and a reinforcing portion 77 protruding from the side and bottom of the main frame 73 and having a coupling portion 78 protruded from the side thereof ( 75 is connected to each other by a horizontal member 60 in contact with each side of the reinforcement portion 77, the coupling portion 78 in the longitudinal direction to the guide groove 54 of the intermediate ladder 70 A sliding ladder coupled to the upper ladder 80 so as to be overlapped with the intermediate ladder 70; Multi-stage elevated ladder, characterized in that configured to include. The method of claim 1, The side member 10 of the lower ladder 30 has a plurality of diaphragm 19 is formed inside the reinforcing portion 17 "

Multi-level elevated ladder, characterized in that it has a cross-sectional shape of ". The method of claim 1, The side member 50 of the intermediate ladder 70 is formed with a plurality of diaphragm 59 in the interior of the reinforcement portion 57 "

Multi-level elevated ladder, characterized in that it has a cross-sectional shape of ". The method of claim 1, The side member 75 of the upper ladder 80 is formed with a plurality of diaphragm 79 in the interior of the reinforcement portion 77 "

Multi-level elevated ladder, characterized in that it has a cross-sectional shape of ". The method according to any one of claims 1 to 4, In order to induce the sliding of the respective ladders (30, 70, 80), respectively comprising a pad (90) interposed on the coupling portion (58, 78) of the main ladder and the main frame (11, 51) Multi-stage elevated ladder characterized by the above.

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