JPH04363498A - Storable ladder - Google Patents

Abstract

PURPOSE:To enhance the portability and workability by journalling crosswise pipes to the inside parts of longitudinal pillar frames having a U-like cross-section so that the crosswise pipes may be freely moved in a vertical direction, by laying spring type locking means in the vertical pillar frames, and by providing catching hook members and cam type fixing means. CONSTITUTION:Crosswise pipes 2 are journalled to the inner surfaces of longitudinal pillar frames 1 by means of position adjusting pipes 6 and bolts 7 so that the crosswise pipes 2 may be freely moved in a vertical direction. When the pipes 2 are folded, the opposite faces 8, 8' of the pillars 1, 1 abut against each other so that the pipes 2 are stored into channels defined by the inner surface of the pillars 1 so as to form a rod-like shape. When the ladder is opened, the pillars is widened while the pipes 2 are extended perpendicular thereto, and then a grip 15 in a spring type locking means 3 is rotated which it is pulled, so that it is fitted in a deep groove 12. Then, the front end part of a lock pin 10 is inserted into each of pipes 2 through a side surface hole 9, and accordingly, the pipe 2 is locked. Then, rotor fittings 16 directly coupled to catching hook members 4 are rotated and are fitted into notched grooves 18 in stationary recess members 17 in cam type fixing means 5, thereby the ladder is surely locked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a retractable ladder that is lightweight, easy to store and open, and has excellent transportability and workability, which is particularly useful in emergencies such as firefighting operations.

[Conventional technology]

Conventionally, ladders used for lifesaving and firefighting activities at disaster sites such as fires have mainly been made of steel and have a bifold or multi-stage telescoping structure.

However, the bi-fold structure ladder requires a large space when extended at a disaster site, and has the disadvantage of being difficult to use in a narrow space.

On the other hand, multi-level telescoping ladders have a complicated structure, and have the problem of significantly increasing weight in order to ensure sufficient length, as they must have a large number of overlapping sections to increase the strength of the support. .

For this reason, ladders with large hooks and the like used for extinguishing fires in high-rise apartment complexes and the like are made of lightweight aluminum alloy materials. However, even in this case, since the large hook portion on which the force is applied is made of steel, the overall weight balance is poor and transportability is problematic.

Furthermore, the large hook part of a ladder is usually closed inward for storage, but the locking mechanism is a pin insertion type that locks the legs apart during use, so the lock often does not work properly. If you apply too much force, damage may occur. If the lock is damaged in this manner, the hook may unnecessarily open outward, creating a dangerous situation.

[Problem to be solved by the invention]

Due to the above-mentioned circumstances, there is a strong demand for ladders used in emergencies such as disaster sites to have a structure that is lightweight, easy to transport, and has excellent workability.

The present invention was developed to meet the above-mentioned requirements.The purpose of the present invention is to have a well-balanced construction made entirely of lightweight materials, easy to open and assemble, compact storage, transportability, workability, and safety. To provide a retractable ladder with excellent functionality.

[Means to solve the problem]

In order to achieve the above object, the retractable ladder according to the present invention includes a horizontal pipe that is pivotally attached to the inner surface of a vertical frame support having a U-shaped cross section so as to be freely movable in the vertical direction, and the horizontal pipe is tilted. When a ladder is opened on the side of the vertical frame support, the tip of the lock pin is inserted horizontally through the side hole. At least one spring-type lock means of a mechanism inserted into the crosspiece pipe is installed, and when rotated 900 times at the upper position of both vertical frame supports, the rotating fitter directly connected to the hook member is connected to the fixed concave member by the spring mechanism. The structural feature is that a cam-type hook fixing means that can be fitted to change the direction is provided, and the entire member is made of titanium or titanium alloy.

[Effect]

Since the retractable ladder of the present invention is configured as described above, by obliquely moving the horizontal pipe from the ladder in the open configuration, the vertical frame supports approach in a parallel movement and their mutually opposing surfaces abut. , each horizontal pipe is stored in a folded state inside the vertical frame support.

Therefore, when the horizontal beam is stored, it transforms into a compact rod shape with both vertical frame supports overlapping, which improves transportability and allows for vehicle loading and storage in a smaller space than before.

When opening the ladder, open the vertical frame supports in the opposite way to the above so that the horizontal pipes are at right angles to the vertical frame supports, and activate the spring-type locking means to lock the tip of the lock pin horizontally. Insert into the crosspiece pipe. This opening operation can be easily and quickly performed in a narrow space without the need to place the ladder on the ground each time, and forms a safe ladder opening configuration.

In addition, when the hook member is rotated 90 degrees, the rotational fitter, which is directly connected to the hook member by a spring mechanism, fits into the fixed concave member and becomes a cam-type fixing means that can change the direction. By pushing and turning the tip of the hook member, it is possible to switch between the usage state and the storage state with a single touch.

Furthermore, since the entire component is made of titanium or titanium alloy, which is lightweight and has superior material strength, heat resistance, and corrosion resistance compared to aluminum alloy, it will not undergo thermal deformation when used at a fire site exposed to flames, and Provides good weight balance and safety. Moreover, since each member can be formed thinner than aluminum alloy, further weight reduction can be achieved.

Excellent transportability is achieved through such mechanical and material effects.
Improves workability and safety.

Although the retractable ladder according to the invention is particularly useful for firefighting, it is not limited to this, and it goes without saying that it can also be used for evacuation purposes and for general household purposes.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments.

Figure 1 shows the main parts of the retractable ladder of the present invention.
(a) is a side view, and (b) is a front view.

In these figures, 1 is a vertical frame support, 2 is a horizontal pipe for raising and lowering the footrest, 3 is a spring type locking means, 4 is a hook member, and 5 is a cam type fixing means. The materials of these parts are
All made of titanium or titanium alloys.

The connection between the vertical frame support 1 and the horizontal frame pipe 2 is shown in Figure 2 [Figure 1 (
As shown in the A-A' diagram of b), a horizontal pipe 2 is pivotally attached to the inner surface of both vertical frame supports having a U-shaped cross section via a position adjustment pipe 6 and a bolt 7 so as to be freely movable in the vertical direction. It has a structure. Therefore, when the horizontal pipe 2 is tilted, the vertical frame supports 1 mutually move in parallel in opposite directions, resulting in the configuration shown in FIG.
), the opposing surfaces 8 and 8' of the vertical frame support 1 come into contact with each other, and the horizontal pipe 2 is transformed into a rod-like form housed in the inner groove of the vertical frame support 1.

When attempting to open a ladder, the vertical frame support 1 is opened in the opposite direction to the above, and the horizontal frame pipe 2 is made perpendicular to the vertical frame support 1 through the sequence shown in Fig. 3(b) and (a). In the form shown in Figure 1,
The spring type locking means 3 is actuated and fixed.

The spring-type locking means 3 is designed to have a mechanism in which the tip of the locking pin 10 is inserted into the horizontal pipe 2 through a side hole 9 bored in the vertical frame support 1, as illustrated in FIG. Install it in one place on the side of the vertical frame support 1. That is, the spring-type locking means 3 shown in FIG. 4 has a locking pin 10 equipped with a handle 15 mounted through a coiled spring 14 in a cylindrical tube 13 having a shallow groove 11 and a deep groove 12 at an angle of 90 degrees at the end thereof. When opened, the handle 15 is fitted into the shallow groove 11 as shown in Fig. 4(a), and the tip of the lock pin 10 is set away from the horizontal pipe 2, and when fixed, as shown in Fig. 4. When the handle 15 is pulled and rotated 90 degrees to fit into the deep groove 12 as shown in (b), the coiled spring 1
4, the tip of the lock pin 10 is extended first and inserted into the horizontal pipe 2, and the horizontal pipe 2 is securely fixed. At this time, if the tip of the lock pin 10 is formed into a curved concave shape so as to be held against the pivot bolt 7 in the horizontal beam pipe 2 during insertion, fixation will be further ensured.

The cam type fixing means 5 is a member installed at the upper part of both vertical frame supports 1 in order to make the hook 4 function, and when the hook is rotated by 90 degrees as shown in FIG. 5, the hook member is fixed by a spring mechanism. 4
The rotary fitting 16, which is directly connected to the fixed recessed member 17, is designed to have a structure in which the direction can be changed by fitting into the fixed recessed member 17. The specific structural mechanism is that the inside is cylindrical and there are four notched grooves 1 at equal intervals on the end.
8, and a member connected to the hook member 4, whose intermediate portion penetrates the cylindrical interior via a coiled spring 14, and has a rotating fitting 16 fixed to its base end. has been done. When storing, the rotary fitting 16 is fitted into the cutout groove 18 of the fixed concave member 17 with the hook member 4 in the folded state as shown in FIG. 5(a). When in use, press and rotate the hook member 4 as shown in FIG. 5(b) to release the fitted state, and then rotate it 90 degrees as shown in FIG. 5(c) to release the rotating member 16. It is fitted into another notch groove 18 of the fixing recessed member 17 to securely fix it. In this case, if the notch groove 18 of the fixed concave member 17 is tapered as shown in the figure, the rotary fitting 16 will automatically rotate simply by rotating the hook member 4, so that the work can be done with one touch. It becomes possible to do so.

〔Effect of the invention〕

As described above, the storage ladder with the structure according to the present invention is made of titanium or titanium alloy, which is lightweight and has excellent material strength and heat resistance stability, in a well-balanced manner, and is extremely compact when stored. The spring-type locking means for fixing the horizontal pipe when opening and the cam-type fixing means for changing the direction of the hook member are quick and easy to operate, ensuring a safe and secure fixed state at all times. can be formed.

Therefore, compared to conventionally structured ladders, it has improved transportability and workability.
Since it has a significant improvement effect in terms of safety, it is extremely useful as a bar-shaped ladder, especially for use in emergencies such as firefighting operations.

[Brief explanation of drawings]

FIG. 1 shows the main parts of a retractable ladder according to the present invention, with (a) being a side view and (b) being a plan view. FIG. 2 is a partially cutaway sectional view taken along line AA' in FIG. 1(b). FIGS. 3(a) and 3(b) are explanatory diagrams showing the stored state of the ladder. Fig. 4 is a partially cutaway sectional view illustrating the spring-type locking means, in which (a) shows the open state and (b) shows the fixed state. Fig. 5 shows the hook member. A partially cutaway sectional view illustrating a cam-type fixing means, (a) is when stored (b)
) shows the state when the direction changes, and (c) shows the state of use. 1...Vertical frame support 2...Horizontal pipe 3...Spring type locking means 4...Hook member 5...Cam type fixing means 6...Position adjustment tube 7...Bolt 8, 8'...Opposing surface 9...Side hole 10...Lock pin 11... Shallow groove 12... Deep groove 13... Cylindrical pipe 14... Coiled spring 15... Handle 1
6... Rotating fitter 17... Fixed concave member 18... Notch groove

Claims (1)

[Claims] Claims: 1. A vertical frame support, in which a horizontal pipe is pivotally attached to the inner surface of a vertical frame support having a U-shaped cross section so as to be freely movable in the vertical direction; A spring-type lock that has a structure in which a horizontal pipe is housed inside, and has a mechanism in which the tip of the lock pin is inserted into the horizontal pipe through a side hole when a ladder is opened on the side of the vertical frame support. The cam is provided with means at at least one location, and when the cam is rotated by 90 degrees to the upper position of both vertical frame supports, the rotating fitting directly connected to the hook member is fitted into the fixed concave member by a spring mechanism, and the direction can be changed. 1. A retractable ladder characterized in that a mold fixing means is provided and the entire member is made of titanium or a titanium alloy.