JP2002054378A - Locking device for folding ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking device for a folding ladder, allowing the folded ladder to be stably held in a storage position. SOLUTION: In the locking device, a pair of front and rear leg bodies 4 and 5 fitted with crossrails 3 are installed between right and left longitudinal frames 2 and 2, the front end part of a tread 6 is pivoted on the crossrail 3 of the leg body 4, and the rear end part thereof is pivoted on the rear leg body 5. The locking device brings locking in use or storage to the folding ladder 1 capable of being folded from a spraddle-legged attitude wherein both of the leg bodies 4 and 5 are spraddled in parallel in the use of the ladder 1 to a close-legged attitude wherein both of the leg bodies 4 and 5 are closed so as to face and overlap each other in the storage of the ladder 1. The side of the leg body 5 is provided with a transverse lever 7 for locking in the use of the ladder 1 and a transverse lever 8, located below the transverse lever 7, for locking in the storage of the ladder 1, and a hook 9 is mounted on a wall surface S. The transverse lever 7 is locked to the hook 9 in the use of the ladder 1, and the hook 9 is provided with a part 9b to be locked, whereto the transverse lever 8 and the crossrail 3 are locked in the storage of the ladder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a folding ladder is used at a required angle on a ladder-standing surface such as a wall surface and the ladder is held by hooking a top end of the ladder to a hook provided on the wall surface or the like. In addition, the present invention relates to a folding ladder locking device for folding a ladder at the time of storage (when not in use), locking the upper end of the ladder with a hook, and storing the ladder in a suspended state. Equipped with a pair of front and rear legs with a horizontal rail attached in multiple vertical stages between the vertical frames, the front end of the tread plate is pivotally attached to the upper side of the horizontal rail of the front leg, and the rear end of the tread plate is attached to the rear Each leg is folded parallel to the legs from the open position when using a ladder that pivots on the legs and the legs are opened in parallel so that each leg is almost horizontal. Foldable ladder that can be folded to the closed position when storing the ladder when using the ladder and when storing the ladder It relates to a device for stopping.

[0002]

2. Description of the Related Art Conventionally, in a folding ladder of this type, a hook for locking when using a ladder and a hook for locking when storing a ladder located below the hook are attached to the upper end side of a rear leg. On the ladder resting surface such as the wall on which the ladder rests, the above-mentioned hooks provided on the rear leg of the ladder are attached with lockable horizontal rods, and when using the ladder, the upper hook is locked to the horizontal rods, At the time of storing the ladder, the hook on the lower side is locked to the horizontal rod, and the folded ladder is stored in a suspended state.

[0003]

In the conventional folding ladder,
Because the hook for attachment is attached to the ladder side, when carrying the ladder when moving the ladder to another place,
There is a danger that the hook may be caught on the worker's clothes or hurt the worker's finger.In addition, when storing the ladder, only the rear leg side of the folded ladder is locked, so the folded ladder is stably stored in the storage position. Could not lock.

According to the present invention, by attaching a locking hook to a ladder stand surface and providing a horizontal rod on which the hook is locked on the ladder side, safety during transportation of the ladder or the like can be ensured, and the folded ladder is provided. It is an object of the present invention to provide a folding ladder locking device capable of stably locking the folding ladder to a storage position.

[0005]

The invention according to claim 1 is
A pair of front and rear legs 4 and 5 each having a horizontal rail 3 mounted in a plurality of vertical stages between a pair of left and right vertical frames 2 and 2, and a front end of a tread plate 6 above the horizontal rail 3 of the front leg 4. And the rear end of the tread plate 6 is pivotally attached to the rear leg 5, and the legs 4, 5 are opened in parallel so that each tread 6 is substantially horizontal. When the ladder is used and when the ladder is stored, the folding ladder 1 is foldable to the closed stance when the ladder is stored, in which the treads 6 are folded in parallel with the legs and the legs 4, 5 are closed so that they face each other. A ladder-use locking horizontal bar 7 and a ladder-storage locking horizontal bar located below the horizontal ladder 7 at the upper end side of the rear leg 5. 8 and a hook 9 at a required height position of a ladder-standing surface S such as a wall surface.
The hook 9 is used to lock the horizontal rod 7 for locking when using the ladder when using the ladder, and the horizontal rod 8 for locking when storing the ladder and the horizontal rail 3 of the front leg 4 when storing the ladder. It is characterized in that a locked portion 9b to be locked is provided.

According to a second aspect of the present invention, in the locking device for a folding ladder according to the first aspect, the locked portion 9b of the hook 9 is located at a position close to the ladder stand surface S, and when the ladder is stored. A first engaging concave portion 26 for engaging the locking horizontal rod 8, and a position which is farther from the ladder stand surface S than the first engaging concave portion 26, and which is used when the ladder of the rear leg 5 is used when the ladder is used. It is characterized by having a second engagement recessed portion 27 for engaging the horizontal bar 7 for stopping and engaging the horizontal bar 3 of the front leg 4 when the ladder is stored.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1A and 1B show a folding ladder 1 in use in an open leg posture, wherein FIG. 1A is a front view and FIG. 1B is a side view. 2A and 2B show a state of being stored in a closed posture, in which FIG. 2A is a front view and FIG. 2B is a side view. The folding ladder 1 is provided with a pair of front and rear legs 4 and 5 each having a horizontal rail 3 attached in a plurality of upper and lower stages between a pair of left and right vertical frames 2 and 2, respectively, and the upper part of the horizontal rail 3 of the front leg 4. The front end of the tread 6 is pivotally attached to the side, and the rear end of the tread 6 is pivotally attached to the rear leg 5, so that the legs 4, 5 are opened in parallel so that each tread 6 is substantially horizontal. From the open leg posture (see FIG. 1) when the ladder is used, the tread plate 6 is folded in parallel with the legs 4 and 5, and the legs are closed so that the legs 4 and 5 face-to-face overlap. (See Fig. 2)
It can be folded into.

This folding ladder 1 is used by leaning on a mezzanine-forming wall surface (ladder resting surface) S so as to be able to ascend and descend between a first-floor floor F and a mezzanine floor 2F in a building. When using a ladder, as shown in FIG.
Lateral rod 7 for locking when using a ladder provided on the upper end side of rear leg 5
9 attached to the upper end of the wall S for forming a mezzanine floor
When the ladder is stored, as shown in FIG. 2, a ladder storage horizontal rod 8 provided below the horizontal rod 7 of the rear leg 5 and a front pedestal 4 side required. Hook 9 with side beam 3
To be locked. The locking device K according to the present invention is constituted by the ladder 1 side horizontal rod 7 for locking when using a ladder, the horizontal rod 8 for locking when storing a ladder, and the hook 9 of the wall (ladder standing surface) S for forming a mezzanine floor. Be composed.

FIG. 3 is an enlarged view of a portion surrounded by a circle indicated by an arrow V in FIG. 1B, and FIG. 4 is an enlarged view of a portion surrounded by a circle indicated by an arrow W in FIG. It is an enlarged view. FIG.
3 is an enlarged sectional view taken along line XX of FIG. 1A, FIG. 6 is an enlarged sectional view taken along line YY of FIG. 2A, and FIG.
FIG. 4B is a cross-sectional view taken along the line M-N, and FIG. Referring to these figures, the structure of the folding ladder 1 will be described in detail. Each of the vertical frames 2 and the horizontal rails 3 constituting each of the legs 4 and 5 and each of the treads 6 are formed from an extruded aluminum alloy material. The cross-sectional shapes of these mold members are shown in FIGS. As can be seen from FIGS. 5 to 7, the inner side surface of each vertical frame 2 forms a shallow groove g having a substantially U-shaped cross section. Both ends of the horizontal rails 3 of the legs 4, 5 are fitted into the grooves g, g on the inner surfaces of the left and right vertical frames 2, 2, and are fixed to the vertical frames 2, 2 by screws a. ing.

As can be seen from FIGS. 5 and 6, the upper edge of each cross bar 3 of the front leg 4 and the front edge of each tread plate 6 have
A horizontal rail side hinge portion 10 and a tread side hinge portion 11 which are rotatably engaged with each other are formed integrally over the entire length in the width direction, respectively. The front end is pivotally attached to the cross rail 3 of the front leg 4. Similarly, the horizontal rail side hinge portion 13 and the tread plate side hinge portion 14 that are rotatably engaged with each other also at the upper end edge of each horizontal rail 3 of the rear leg 5 and the rear end edge of each tread plate 6. Are formed integrally over the entire length in the width direction.
The rear end of the tread plate 6 is pivotally attached to the cross rail 3 of the rear leg 5 by the hinges 15 composed of 3 and 14.

Thus, the horizontal rail side hinge part 10 of the hinge 12 for pivotally connecting the front end of the tread plate 6 to the horizontal rail 3 of the front leg 4 is
The guide wall portion 16 has an arc-shaped cross section, and an engaging wall portion 17 having a substantially hook-shaped cross section protruding from the inner peripheral side of the guide wall portion 16. Part 1
6 is a guided wall portion 1 having an arc-shaped cross section which is rotatably fitted to the outer wall 6.
8 and an engaged wall portion 19 projecting from the inner peripheral side of the guided wall portion 18 and rotatably engaged with the engaging wall portion 17 and having a substantially hook-shaped cross section.

A horizontal rail side hinge portion 13 of a hinge 15 for pivotally connecting the rear end of the tread plate 6 to the horizontal rail 3 of the rear leg 5 has a guide wall portion 20 having an arc-shaped cross section, An engaging wall portion 21 having a substantially hook-shaped cross section protruding from an inner peripheral side of the guide plate 20, and the tread-side hinge portion 14 is rotatably fitted to the guide wall portion 20 in an arc-shaped cross section. Guided wall 22 of
And an engaged wall portion 23 having a substantially hook-shaped cross section which is protrudingly provided on the inner peripheral side of the guided wall portion 22 and is rotatably engaged with the engaging wall portion 21. As can be seen from FIG. 7, brackets 24, 24 made of a steel plate are respectively attached and fixed to the left and right end surfaces of each tread plate 6 with screws b. A plastic spacer 25 is attached to the outer surface.

FIG. 8 is an enlarged view of a portion of the locking device K surrounded by an ellipse indicated by an arrow O in FIG. 1B, and FIG. 9 is FIG.
11A is an enlarged view of a portion of the locking device K surrounded by an ellipse indicated by an arrow P. FIG. 10A shows a state in which the locking horizontal rod 7 is locked to the hook 9 when the ladder is used when the ladder is used. Enlarged vertical sectional view,
FIG. 4B is an enlarged vertical sectional view showing a state in which the ladder is stored and the required horizontal bar 3 of the front leg 4 is locked to the hook 9 when the ladder is stored. The horizontal rod 7 for locking when using the ladder and the horizontal rod 8 for locking when storing the ladder are hollow round shafts made of an extruded aluminum material, respectively, and are provided between the left and right vertical frames 2 and 2 of the rear leg 5. It is mounted and fixed.

The hook 9 is integrally formed with an extruded aluminum alloy material so as to have a width to fit between the left and right legs 4 and 5 of the ladder 1. A vertical plate-shaped mounting portion 9a which is in contact with and fixed with screws or the like, and a horizontal rod 7 projecting horizontally from the mounting portion 9a and engaging the ladder on the rear leg 5 when the ladder is used. It comprises a horizontal rod 8 for locking the ladder when the ladder is stored and a horizontal bar 8 for locking the horizontal rail on the front leg 4 when the ladder is stored. Locked part 9b
Is located at a position close to the wall surface S, and has a first engagement recess 26 having an arc-shaped cross section for engaging the ladder-accommodating horizontal rod 8 when the ladder is accommodated. A second section having an arc-shaped cross section for engaging the horizontal rod 7 for locking when using the ladder of the rear leg 5 when using the ladder and for engaging the horizontal bar 3 when using the ladder when storing the ladder. An engagement recess 27 is provided. In this embodiment, the entire hook 9 is formed integrally, but it may be divided into a pair of left and right hook portions, for example.

Next, the folding ladder 1 constructed as described above.
The operation of the ladder locking device K will be described with reference to FIG.
3, 5, 7A, 8 and 10A.
Shows the state when the ladder is used. In this state, the folding ladder 1 has the two legs 4 and 5 so that the treads 6 are substantially horizontal.
Is in the open leg position with the legs open in parallel. Therefore, when the ladder is used, as shown in FIGS.
The rear leg 5 is provided at the upper end of the ladder for use when locking the horizontal rod 7
Of the hook 9 attached to the wall S,
The ladder 1 in the opened state is locked by engaging with the engagement recess 27.
Can be held stably, and safety in use can be ensured.

When the folding ladder 1 has been used in the open leg position as described above and the ladder 1 is to be stored, the ladder 1 is to be stored.
1 is lifted with both hands from the state shown in FIG. 1, and the horizontal rod 7 for locking at the upper end of the rear leg 5 is released from the hook 9. When the rear leg 5 is lifted with the front leg 4 resting on the floor, each tread plate 6 rotates upward as shown by the large arrow in FIGS. 2, 4, 6, and 7 (B), the rear leg 5 is folded parallel to and parallel to the body 4 and the rear leg 5 is overlapped with the front leg 4.
The closed posture is as shown in FIG.

At the time of storing the ladder in this closed posture, as shown in FIGS. 9 and 10B, the horizontal rod 8 for storing the ladder of the rear leg 5 at the time of storing the ladder is engaged with the locked portion 9b of the hook 9. The horizontal bar 3 of the front leg 4 is locked to the second locking recess 27 of the locked portion 9b while being locked to the first locking recess 26. Note that the ladder storage horizontal rod 8 needs to be mounted at the same height position as the adjacent horizontal rail 3 when the front and rear legs 4 and 5 are folded. In addition, the mounting position of the horizontal rod 7 for locking when using a ladder depends on the inclination angle of the ladder 1 leaning on the wall (ladder standing surface) S for forming the mezzanine floor. Just set it.

As described above, when the ladder is housed, the locking lateral rod 8 of the rear leg 5 when the ladder is housed is engaged with the hook 9 in the first engagement concave portion 26, and the horizontal rail 3 of the front leg 4 is attached. Second engagement recess 2
7, the ladder 1 folded in a flat plate shape is stably suspended in a state of being suspended by the hook 9 along the wall surface (ladder stand surface) S substantially parallel thereto, and is stored smartly and compactly. be able to.

The locked portion 9b of the hook 9 is provided with a first engagement concave portion 26 for engaging the horizontal rod 8 for locking when the ladder is stored when the ladder is stored.
At a position farther from the wall surface S than the first engagement recessed portion 26, the rear leg 5 is used to engage the ladder-use locking horizontal rod 7 when the ladder is used, and the front leg is used when the ladder is stored. Yokobashi 3
Are formed in the second engagement recess 27 for engaging the first engagement recess 26 and the second engagement recess 27 in this manner, and are not partitioned into the first engagement recess 26 and the second engagement recess 27 in this manner, and FIGS. As shown by an imaginary line in FIG. 7A, when the ladder is used, the locking horizontal rod 7 is locked when the ladder is used, and when the ladder is stored, the horizontal rod 8 for locking when the ladder is stored and the horizontal rail 3 of the front leg 4 are moved. The locked portion may be a simple concave portion 28 that can be locked.

However, the first engagement recess 26 and the second engagement recess 2
According to the locked portion 9b defined in the first and second sections 7, the horizontal rod 8 for locking the rear leg 5 when storing the ladder and the horizontal rail 3 of the front leg 4 when storing the ladder are connected to the first engagement recess 26. Therefore, the folded ladder can be stored and held extremely stably at the storage position.

[0021]

According to the first aspect of the present invention, there is provided a ladder locking device.
On the upper end side of the rear leg, a horizontal rod for locking when using a ladder and a horizontal rod for locking when storing the ladder located below this horizontal rod,
Attach a hook at the required height of the ladder stand surface such as a wall surface, and use this hook to lock the horizontal rod for locking when using the ladder when using the ladder, as well as the horizontal rod for locking when storing the ladder and the front part when storing the ladder. When the ladder is carried, the hooks are provided on the side of the ladder stand, and the horizontal rods that the hooks lock are provided on the ladder side. For example, there is no danger of the hook being hooked on the clothes of the worker or damaging the fingers of the worker, so that the safety during transportation of the ladder or the like can be ensured.

Further, when the ladder is used, the ladder in the opened state can be stably held by locking the horizontal rod for locking the ladder on the rear leg to the locked portion of the hook when the ladder is used. The folding ladder is attached almost parallel to the ladder resting surface by locking the horizontal rod for locking when storing the ladder of the leg to the locked part of the hook, and it is stable and compact with the hook suspended from the hook Can be stored.

According to the ladder locking device of the second aspect of the present invention, the locked portion of the hook is located at a position close to the ladder standing surface, and is engaged with the ladder storing locking horizontal rod when the ladder is stored. A first engaging recess to be engaged with the ladder-standing surface, which is located farther from the ladder-standing surface than the first engaging recess. Since there is a second engaging recess for engaging the horizontal rail of the leg, the horizontal rail for locking when the ladder is stored in the rear leg and the horizontal rail of the front leg when the ladder is stored, The first and second engagement recesses can be properly engaged with the respective engagement engagement recesses, and the folded ladder can be stored and held in the storage position extremely stably.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the folding ladder of the present invention in use in an open leg posture, wherein (A) is a front view and (B) is a side view.

FIGS. 2A and 2B show a state in which the folding ladder is stored in a closed leg posture, wherein FIG. 2A is a front view and FIG. 2B is a side view.

FIG. 3 is an enlarged view of a portion surrounded by a circle indicated by an arrow V in FIG.

FIG. 4 is an enlarged view of a portion surrounded by a circle indicated by an arrow W in FIG.

FIG. 5 is an enlarged cross-sectional view taken along line XX of FIG.

FIG. 6 is an enlarged sectional view taken along the line YY of FIG.

7A is a sectional view taken along line MM of FIG. 3, and FIG. 7B is a sectional view taken along line NN of FIG.

8 is an enlarged view of a locking device portion surrounded by an ellipse indicated by an arrow O in FIG. 1B.

9 is an enlarged view of a locking device portion surrounded by an ellipse indicated by an arrow P in FIG. 2 (B).

10A is an enlarged vertical sectional view showing a state in which the ladder is used when the ladder is used, and the locking horizontal rod is locked to the hook when the ladder is used. FIG. It is an expanded longitudinal cross-sectional view of a state where a required horizontal rail of a leg was locked to a hook.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Folding ladder 2 Vertical frame 3 Horizontal beam 4 Front leg 5 Rear leg 6 Treadboard 7 Horizontal rod for locking when using a ladder 8 Horizontal rod for locking when storing a ladder 9 Hook 9a Hook attaching part 9b Hook cover Locking portion 12 Hinge at front end of tread plate 15 Hinge at rear end of tread plate 26 First engagement recess of hook engaged portion 27 Second engagement recess of hook engaged portion of hook

Claims (2)

[Claims] A pair of front and rear legs each having a horizontal rail attached in a plurality of vertical stages between a pair of left and right vertical frames, and a front end of a tread plate is pivotally mounted on the upper side of the horizontal rail of the front leg. From the open position when using a ladder, the rear end of the tread is pivotally attached to the rear leg, and both legs are opened in parallel so that each tread is substantially horizontal. A device for locking a foldable ladder that can be folded to a closed position when storing a ladder in which the legs are closed so that both legs are face-to-face overlapping when the ladder is used and when the ladder is stored, comprising a rear leg. At the upper end side of the ladder, a horizontal rod for locking when using a ladder and a horizontal rod for locking when storing the ladder located below this horizontal rod are attached, and a hook is attached to the required height position of the ladder stand surface such as a wall surface, This hook locks the horizontal rod for locking when using the ladder when using the ladder, and for locking when storing the ladder when storing the ladder. A locking device for a folding ladder, comprising a locked portion for locking a horizontal bar and a horizontal rail of a front leg. 2. The first hooked concave portion, which is located at a position close to the ladder-standing surface, for engaging the ladder storing horizontal rod when the ladder is stored, and the first hooked portion. A second engaging member which is located at a position farther from the ladder stand surface than the concave portion, engages the locking horizontal rod when using the ladder of the rear leg when using the ladder, and engages the horizontal rail of the front leg when storing the ladder. The folding ladder locking device according to claim 1, further comprising a fitting recess.