JPH054560Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention particularly relates to a slip-preventing structure for a sliding ladder used for ascending and descending into an attic storage area.

[Background technology]

Recently, a ladder device as shown in FIGS. 4 and 5 has been proposed for climbing up and down the attic storage area. 4 and 5, reference numeral 2 denotes an opening frame, which is formed on the ceiling 1. In FIG. A cover plate 21 is attached to the lower end of the opening frame 2 so as to be openable and closable. A sliding ladder 3 whose length is extendable and retractable is disposed within the opening frame 2. As shown in FIG. 5, the ladder 3 is slid and extended to the floor surface with the cover plate 21 opened downward.
Further, when closing the cover plate 21, the ladder 3 is shortened, rotates together with the cover plate 21, and is housed in the opening frame 2. In addition, the ladder 3 has a cover plate 21 and an arm 22.
The arm 22 is rotatably connected to the connecting bracket 24 by a spring 23.

The ladder 3 has a pair of side beams 10a, 10a and 10b, 1 made of metal material such as aluminum.
Step board (not shown) between 0b and 10c, 10c
It is composed of ladder members 3a, 3b, and 3c. Then, the side beam 1 of the ladder member 3a
The stringer 10b of the ladder member 3b is placed on the ladder member 3b, and the stringer 10c of the ladder member 3c is placed on the stringer 10b of the ladder member 3b.
In order to allow the ladder member 3b to slide freely relative to the ladder member 3b, these side beams 10a, 10b and 1
0b and 10c are connected and held by holders 25 and 26, respectively.

However, as shown in FIGS. 6A and 6B, when the ladder 3 is extended and extends from the upper floor to the lower floor, when a load is applied to the middle ladder member 3b, the lower ladder member 3c and the middle A slide occurs between the ladder member 3b and
The inclination angle θ of ladder 3 increases (θ<θ'),
It was dangerous to go up and down.

Therefore, as shown in FIG. 7, a hook 27 is rotatably provided on the holder 25 attached to the lower ladder member 3c, and a hook 27 is rotatably provided in the holder 26 attached to the upper ladder member 3b in the sliding direction of the ladder 3. A hook receiver 2 in which a hook 27 locks the front corner along the
An anti-slip device for a sliding ladder configured as No. 8 has been proposed.

FIG. 8 is a cross-sectional view taken along the - line of the anti-slip device shown in FIG. 7. As shown in FIG. 8, in this anti-slip device, when the lower ladder member 3c is slid downward, the tip of the hook 27 hits the rear angle of the holder 26 along the sliding direction of the ladder 3. When the hook 27 contacts and is pushed up onto the holder 26 and the sliding of the lower ladder member 3c is completed, the hook 27 falls down under its own weight and locks on the hook receiver 28, that is, the front corner of the holder 26. It is.

Therefore, the lower ladder member 3c is prevented from returning in the extended ladder state, and even if a load is applied to the upper ladder member 3b when the ladder 3 is used, the ladder 3
It is possible to prevent the slope from becoming steep.

However, in this anti-slip device, since the hook 27 is only locked to the hook receiver 28, that is, the front corner of the holder 26, if there is a misalignment between the ladder members 3c and 3b, as shown in FIG. , there was a possibility that the hook 27 could not be engaged with the holder 28 and would shift laterally outward.

[Purpose of invention]

The purpose of this invention is to provide a sliding ladder structure that prevents the hook from shifting laterally.

[Disclosure of invention]

The anti-slip structure of the sliding ladder of this invention is such that the lower ladder member whose front end is placed on the floor and the upper ladder member are connected to the rear end of the lower ladder member and the front end of the upper ladder member. In a sliding ladder in which retainers attached to the lower and upper ladder members are slidably connected and held in contact with each other, a hook is provided on the retainer attached to either one of the lower ladder member and the upper ladder member, and the other holder is provided with a hook receiver to which the hook is locked, and a protrusion on the outer edge of the other holder faces the outer surface of the hook when the hook is locked, and prevents the hook from shifting laterally. It is characterized by having a protruding .

As described above, according to this invention, since the holder for locking the hook is provided with a protrusion for preventing the hook from shifting laterally, it is possible to reliably prevent the hook from coming off the upper surface of the holder and shifting laterally. This allows the hook to be reliably locked to the hook receiver.

As a result, the operation of the hook becomes more reliable, and safety when using the ladder can be improved.

Embodiment An embodiment of this invention will be described based on FIGS. 1 to 3. That is, as shown in FIG. 1, this slide type ladder anti-slip structure connects the lower ladder member 3c whose front end is placed on the floor and the upper ladder member 3b to the lower ladder member 3c. The rear end of the ladder member 3b and the upper ladder member 3b
In the sliding ladder, in which holders 6 and 7 attached to the front ends of the ladder member 3c are slidably connected and held in contact with each other, a hook 4 is provided on the holder 6 attached to the lower ladder member 3c, and a hook 4 is provided on the holder 6 attached to the lower ladder member 3c. The holder 7 attached to the member 3b is provided with a hook receiver 5 on which the hook 4 is engaged, and a hook receiver 5 is provided on the outer edge of the holder 7 to face the outer surface of the hook 4 when the hook 4 is engaged. A protrusion 8 is provided to prevent lateral displacement.

As shown in FIGS. 1 and 2, each ladder member 3b, 3c has an I-shaped cross section made of a metal material such as aluminum, and is connected between the side beams 10b and 10b.
It is constructed by attaching a step board (not shown) between 0c and 10c. The stringer 10c of the ladder member 3c is located on the stringer 10b of the ladder member 3b, and in order to make the ladder member 3c slidable with respect to the ladder member 3b, a holder 6 is attached to these stringers 10b, 10c. , 7. As shown in FIG. 1, the holders 6 and 7 are attached to the rear end of the lower ladder member 3c and the front end of the upper ladder member, respectively.

As shown in FIG. 3, the holder 7 consists of a mounting part 7a and a coupling part 7b, and the mounting part 7a has a screw insertion hole 9 formed therein for fixing it to the stringer 10b of the ladder member 3b. Two grooves 10 and 11 are formed on one side of the groove 7b, into which the opposing flanges of the side beams 10b and 10c are respectively inserted to hold the side beams 10b and 10c apart. Furthermore, a protrusion 8 for preventing the hook 4 from slipping laterally is provided on the outer edge of the binding part 7b in a protruding manner along the longitudinal direction of the binding part 7b, and the hook 4 locks the front corner of the ladder member 3c in the drawing direction. It is set as hook receiver 5.

As shown in FIG. 1, like the holder 7, the holder 6 also has a mounting part 6a for fixing it to the side beam 10c of the ladder member 3c, and opposing flanges of the side beams 10b and 10c are fitted on one side, respectively. side girder 10
The coupling part 6b has two grooves formed on one side to hold the parts 10b and 10c apart from each other.

As shown in FIG. 1, the hook 4 is rotatably attached to the outer surface of the attachment part 6a of the holder 6 fixed to the rear end of the lower ladder member 3c by means of a spring (not shown) or the like. is extended and the ladder member 3
The inner side of the tip portion 4a is configured to engage the hook receiver 5, that is, the front corner portion of the holder 7, when the slides b and 3c are completed.

As a result of this configuration, when the lower ladder member 3c is slid downward, the tip 4a of the hook 4 comes into contact with the rear angle of the holder 7 in the sliding direction of the ladder, and the upper surface of the holder 7 It is pushed up and moves on the upper surface of the holder 7 along the inside of the projection 8. At this time, since the hook 4 moves along the inside of the protrusion 8, the hook 4 does not come off the holder 7 and laterally shift outward. and,
When the sliding of the lower ladder member 3c is completed,
It falls down under its own weight and is locked to the hook receiver 5, that is, the front corner of the holder 7.

Further, even when the hook 4 is in the locked state, the protrusion 8 can reliably prevent the hook 4 from shifting laterally due to misalignment between the ladder member 3c and the ladder member 3b.

Therefore, when the ladder is used, a load is applied to the upper ladder member 3b, thereby reliably preventing the ladder from sliding and becoming steeply tilted.

In this embodiment, the hook 4 is rotatably attached to the holder 6 attached to the lower ladder member 3c, and the front corner of the holder 7 attached to the upper ladder member 3b is configured as a hook receiver. The hook may be rotatably attached to the holder 7 attached to the upper ladder member 3b, and the rear angle of the holder 6 attached to the lower ladder member 3c may be used as a hook receiver. In addition, the hook is attached to one of the holders of the upper and lower ladder members 3b and 3c, and a protrusion that serves as a hook receiver is fixed to the top surface of the other holder to which the hook is not attached, and the hook is attached to this holder. It may be configured to be locked to a hook receiver. In this case, the protrusion is arranged on the outside of the protrusion along the sliding direction of the ladder.

[Effect of idea]

According to the slide-type ladder anti-slip structure of this invention, the holder that locks the hook is provided with a protrusion to prevent the hook from sliding laterally, thereby ensuring that the hook does not come off the top surface of the holder and slide laterally. The hook can be reliably locked to the hook receiver.

As a result, the operation of the hook becomes more reliable and the safety when using the ladder can be improved.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of this invention, Fig. 2 is a sectional view taken along the - line, Fig. 3 is a perspective view of the holder, Fig. 4 is a sectional view of the ladder device, and Fig. 5 is its use. Fig. 6 is an explanatory diagram showing problems when using a sliding ladder, Fig. 7 is a side view of a conventional sliding ladder locking device, Fig. 8
The figure is a cross-sectional view taken along the line 1, and FIG. 9 is an explanatory diagram showing problems when using the sliding ladder stopper device. 1... Ceiling, 2... Opening frame, 3... Ladder, 4
...Hook, 5...Hook receiver, 6,7...Holder, 8...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A lower ladder member whose front end is placed on the floor and an upper ladder member are attached to the rear end of the lower ladder member and the front end of the upper ladder member, respectively. In a sliding ladder in which retainers are slidably connected and held in contact with each other, a hook is provided on the retainer attached to either one of the lower ladder member and the upper ladder member, and the other retainer is attached to the lower ladder member and the upper ladder member. The tool is provided with a hook receiver on which the hook is locked, and a protrusion is provided on the outer edge of the other holding tool to face the outer surface of the hook when the hook is locked, and to prevent the hook from shifting laterally. Features a sliding ladder structure that prevents slipping.