JPH0443531Y2 - - 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. 5 and 6 has been proposed for ascending and descending into attic storage areas. In FIGS. 5 and 6, it is a double opening frame and is formed on the ceiling 1. 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. 6, the ladder 3 is slid and extended to the floor 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.

Further, the ladder 3 is rotatably connected by a cover plate 21 and an arm 22, and a spring 23 connects this arm 22 and a connecting bracket 24.

The ladder 3 is composed of ladder members 3a, 3b, and 3c each having a tread (not shown) installed between a pair of side beams 8a, 8a and 8b, 8b, and 8c, and 8c made of a metal material such as aluminum. be done. The stringer 8b of the ladder member 3b is placed on the stringer 8a of the ladder member 3a, and the stringer 8c of the ladder member 3c is placed on the stringer 8b of the ladder member 3b. These side beams 8a, 8b and 8b, 8c are connected and held by holders 25, respectively, in order to allow the ladder member 3c to slide freely relative to the ladder member 3b.

However, as shown in Figure 7, ladder 3
When a load is applied to the middle ladder member 3b while the ladder member 3b is extended and extended from the upper floor to the lower floor,
A slide occurred between the lower ladder member 3c and the middle ladder member 3b, and the angle of inclination of the ladder 3 increased, making it dangerous to ascend and descend.

[Purpose of invention]

The purpose of this invention is to provide a slip-stop structure for a sliding ladder that prevents the inclination angle of the ladder member from increasing when the ladder is ascended and descended, thereby increasing the safety of ascending and descending.

[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, the retainer attached to either one of the lower ladder member and the upper ladder member is provided with a hook; Further, a hook receiver is provided to which the hook is engaged with the other holder when both of the ladders are in an extended state.

Thus, according to this invention, a hook is provided on the holder attached to either the lower ladder member or the upper ladder member, and the hook is engaged with the holder attached to the other ladder member. Since the hook receiver is provided, the lower ladder member is prevented from returning in the extended state of the ladder. As a result, even if a load is applied to the upper ladder member when the ladder is extended and the front end of the lower ladder member is placed on the floor, the ladder will not slide and the slope will not become steep. This can improve safety when going up and down.

Embodiment An embodiment of this invention will be explained based on FIGS. 1 to 4. 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 slide type ladder 3 in which holders 6 and 7 attached to the front ends of the lower ladder member 3c are slidably connected and held in contact with each other, the lower ladder member 3c
A hook 4 is provided on the holder 6 attached to the upper ladder member 3b, and the front corner of the holder 7 attached to the upper ladder member 3b is used as a hook receiver 5 to which the hook 4 locks.

As shown in FIG. 2, each ladder member 3b, 3c
is a cross section I made of metal material such as aluminum
It is constructed by attaching a footboard 9 between the side beams 8b and 8b and between 8c and 8c of the shape. Figure 2 Ladder member 3
It is an exploded perspective view showing the connection structure between b and 3c. As shown in FIG. 2, the stringer 8c of the ladder member 3c is located on the stringer 8b of the ladder member 3b,
These side beams 8b, 8c are held by holders 6, 7 in order to make the ladder member 3c slidable with respect to the ladder member 3b.

As shown in FIG. 2, the holder 7 consists of a mounting part 7a and a coupling part 7b.The mounting part 7a has a screw insertion hole 13 for fixing it to one of the side beams 8b, and the coupling part 7b has a screw insertion hole 13 for fixing it to one of the side beams 8b. Both side girders 8b, 8 on one side
Two grooves 11 and 12 are formed into which the opposing flange portions 8d and 8d of c are inserted, respectively, to hold the side beams 8b and 8c apart. 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 3b, respectively.

As shown in FIG. 1, the hook 4 is rotatably attached to the outer surface of the attachment portion 6a of the holder 6 fixed to the rear end of the lower ladder member 3c.

As shown in FIG. 3, the hooks 4 are a pair connected by a shaft 10, and are arranged on the outsides of both side beams 8c, 8c, respectively. The shaft 10 is inserted through the treadle 9.

Further, as shown in FIG. 1, the hook receiver 5
is the front corner of the holder 7 attached to the front end of the upper ladder member 3b.

As a result of this configuration, as shown in FIG. 4, when the lower ladder member 3c is slid downward, the hook 4 hits the holder 7 attached to the tip of the upper ladder member 3b, and the holder Pushed up above 7. And the lower ladder member 3c
When the slide 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.

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

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 4 may be rotatably attached to a holder 7 attached to the upper ladder member 3b, and the rear corner 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 the holder of one of the upper and lower ladder members 3b and 3c, and a protrusion, etc. that serves as a hook receiver is fixed to the other holder to which the hook is not attached, and the hook is attached to the hook receiver. It may be made to be locked.

[Effects of the invention] According to the slide-type ladder slip prevention structure of this invention, a hook is provided on the holder attached to either one of the lower ladder member and the upper ladder member, and the hook is provided on the holder attached to the other ladder member. Since the hook receiver is provided for locking the hook to the holder attached to the holder, the lower ladder member is prevented from returning in the extended state of the ladder. As a result, even if a load is applied to the upper ladder member when the ladder is extended and the front end of the lower ladder member is placed on the floor, the ladder will not slide and the slope will not become steep. can do. In other words,
Since the load applied to the upper ladder member is supported by the lower end of the lower ladder member via the hook, the ladder is prevented from shifting. This has the effect of increasing safety when going up and down.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of this invention, Fig. 2 is an exploded perspective view showing a structure for holding ladder members together;
Fig. 3 is a perspective view of the hook, Fig. 4 is an explanatory diagram showing the operation of an embodiment of the invention, Fig. 5 is a sectional view of the ladder device, Fig. 6 is a sectional view of the ladder device in use, and Fig. 7 is a sectional view of the ladder device. The figure is an explanatory diagram showing problems when using a sliding ladder. 2... Opening frame, 3... Ladder, 3a, 3b, 3
c... Ladder member, 4... Hook, 5... Hook receiver, 6, 7... Holder, 8a, 8b, 8c...
Stringers.

Claims (1)

[Claims for Utility Model Registration] (1) A lower ladder member whose front end is placed on the floor and an 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 respective attached holders are slidably connected and held in contact with each other, a hook is provided on the holder attached to either one of the lower ladder member and the upper ladder member, and A structure for preventing slippage of a sliding ladder, characterized in that a hook receiver is provided to which the hook is locked to the other holder when both ladders are in an extended state. (2) The hook is rotatably attached to the outer surface of the holder attached to the lower ladder member, and the hook receiver is a front corner of the holder attached to the front end of the upper ladder member. A structure for preventing slipping of a sliding ladder as described in claim (1) of the utility model registration.