JP6414395B2 - Handrails and hooks for ladders - Google Patents

Description

  The present invention relates to a handrail and hook metal fitting mounted on a lifting ladder such as a bunk bed.

Various ladders that are used when raising and lowering a bunk bed and simple type ladder stairs that are used by moving to a place with a difference in elevation indoors have been proposed and put into practical use.
For example, Patent Document 1 proposes a structure in which a ladder can be stored in an upper bed body as an elevating ladder for a bunk bed.
Further, Patent Document 2 proposes a ladder staircase with a handrail that forms a handrail portion using a side plate and is easy to grasp without being obstructed when going up and down.

  Further, Patent Document 3 discloses a ladder having a hook that can be locked to a side frame of a bunk bed.

Japanese Patent No. 2631176 JP 2006-149642 A JP 2009-297381 A

In the case of a conventional ladder for raising and lowering a bunk bed that is made of wood, a metal fitting called a fitting or a hook is provided at the upper end of the ladder. And this metal fitting prevents the upper end part of a ladder from removing from the side frame etc. of a bunk bed. (See Patent Document 2 and Patent Document 3)
However, the mounting brackets and hooks provided on conventional lifting ladders are fixed to the wooden ladder with screws (wood screws), etc., and when excessive external force is applied, the mounting brackets and hooks are mounted from the ladder (ladder side plate). There was a problem that there was a risk of losing.

Further, the mounting bracket and the hook are provided only for the purpose of mounting, and there has been a problem that a better appearance is desired as the form of the entire ladder.
The present invention has been made to solve such problems, and has a simple structure, improved safety, and a good-looking ladder handrail and hook metal fitting, and a bunk bed using the metal fitting. The main purpose is to provide a ladder for lifting and the like.

The invention according to claim 1 is a handrail and hook metal fitting to be mounted on an elevator ladder such as a bunk bed, wherein the elevator ladder includes a pair of wooden side plates, A handrail forming portion that is attached to each one end side of the pair of wooden side plates, is formed of a metal plate material having a predetermined width and extends linearly, and the handrail via a curved portion on a lower side of the handrail forming portion. A lower connecting portion that is provided integrally with the forming portion and is formed by bending a lower end of the handrail forming portion so as to be parallel to the handrail forming portion, and is opposed to the handrail forming portion of the lower connecting portion. A mounting surface provided on a surface opposite to the surface, a nut that is welded to the mounting surface and protrudes from the mounting surface and functions as a positioning protrusion, and the handrail forming portion via a curved portion above the handrail forming portion The upper connecting part provided integrally with The upper connecting portion includes a horizontal extension portion extending in a horizontal direction toward the rear side of the handrail forming portion and a hook portion in which a tip of the horizontal extension portion is bent downward in a bowl shape, and the horizontal extension portion And an upper connecting part in which a bolt insertion hole is formed in the middle part of the handrail and hook metal fitting.

請 Motomeko 2 the described invention, a lifting ladder unit such as bunk beds handrail and hook bracket of claim 1 Symbol mounting is mounted.

The present invention is a structure in which the handrail and hook metal fitting is integrally formed of metal, and in particular, the handrail forming portion and the hook portion are integrally connected. Therefore, when mounted on the ladder, it is possible to obtain a handrail and hook metal fitting that has a sense of unity with the ladder and has a good appearance.
Moreover, since the nut in the lower connecting portion is screwed with the bolt inserted into the side plate of the ladder, even if a large external force is applied in the direction of pulling the handrail (the direction away from the side plate of the ladder), the lower connecting portion is separated from the side plate of the ladder. There is no fear of coming off.

In addition, since the locking bolt is fitted in the direction orthogonal to the external force, the upper connection portion is not likely to come off from the ladder side plate in the connection between the upper end of the ladder side plate and the handrail / hook fitting in the upper connection portion.
Therefore, according to the present invention, it is possible to provide a handrail and hook metal fitting for a ladder which is highly safe and has a good appearance, and a ladder for raising and lowering using the metal fitting.

FIG. 1 is a left partial side view showing a main configuration of an elevating ladder 20 to which a handrail and hooking metal fitting 1 according to an embodiment of the present invention is attached. FIG. 2 is a partial front view showing the upper part of the elevating ladder 20 to which the handrail and hooking metal fitting 1 according to one embodiment of the present invention is attached. FIG. 3 is a partial rear view showing the upper part of the raising / lowering ladder 20 to which the handrail and hooking metal fitting 1 according to one embodiment of the present invention is mounted. FIG. 4 is a partial plan view of an elevating ladder 20 to which the handrail and hooking metal fitting 1 according to one embodiment of the present invention is mounted. FIG. 5 is a left side view of the metal frame 1 ′ that forms the core of the handrail / hook metal fitting 1. FIG. 6 is a front view of a metal frame 1 ′ that forms the core of the handrail / hook metal fitting 1. FIG. 7 is a bottom view of the metal frame 1 ′ that forms the core of the handrail / hook metal fitting 1. FIG. 8 is a left side view of the handrail / hook metal fitting 1 in a state where the surface of the metal frame 1 ′ shown in FIG. 5 is covered with a resin. FIG. 9 is a front view of the handrail / hook metal fitting 1 in a state where the surface of the metal frame 1 ′ shown in FIG. 6 is covered with a resin. FIG. 10 is a bottom view of the handrail / hook metal fitting 1 with the surface of the metal frame 1 ′ shown in FIG. 7 covered with resin.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a left partial side view showing a main configuration of an elevating ladder 20 to which a handrail and hooking metal fitting 1 according to an embodiment of the present invention is attached. FIG. 2 is a partial front view showing the upper portion of the ladder 20. FIG. 3 is a partial rear view showing the upper portion of the ladder 20. FIG. 4 is a partial plan view of the ladder 20.

1 to 4, the ladder 20 has a pair of long side plates 21 on both the left and right sides, and a tread plate 22 is horizontally provided between the pair of side plates 21 at regular intervals. The footboard 22 may be reinforced with a reinforcing material 23 as necessary.
A feature of the ladder 20 according to this embodiment is that the handrail and hooking metal fitting 1 is provided on the upper end side of the pair of side plates 21. The handrail / hook metal fitting 1 is integrally formed of metal and has a structure in which the surface is covered with a resin film.

Referring to FIG. 1, a handrail and hooking metal fitting 1 is a long handrail forming portion having a linear shape extending in the length direction (vertical direction) of the side plate 21 with a predetermined distance from the front edge surface 21 f of the ladder side plate 21. 2 has.
A lower connecting portion 3 is formed integrally with the handrail forming portion 2 below the handrail forming portion 2. More specifically, the lower end of the handrail forming portion 2 is the curved portion 4, and the lower end of the handrail forming portion 2 is curved in the direction of the front edge surface 21 f of the side plate 21. And the front-end | tip of the curved part 4 is bent by about 90 degree upwards, for example, and the lower connection part 3 is formed.

Note that the lower connecting portion 3 may be formed by bending the distal end of the bending portion 4 approximately 90 ° downward rather than upward.
The lower connecting portion 3 forms a mounting surface 5 whose back surface (surface facing the front edge surface 21f) abuts on the front edge surface 21f. A nut 6 is fixed to the mounting surface 5 by welding, for example. The nut 6 protrudes rearward from the mounting surface 5 and also functions as a positioning protrusion for positioning the lower connecting portion 3 with respect to the front edge surface 21 f of the side plate 21. A receiving concave portion 27 for receiving the nut 6 is formed on the front edge surface 21f.

  On the upper side of the handrail forming portion 2, an upper connecting portion 7 is extended integrally with the handrail forming portion 2. The upper connecting portion 7 is a curved portion 8 formed continuously from the upper end of the handrail forming portion 2, a horizontal extending portion 9 formed continuously from the curved portion 8 and extending rearward in the horizontal direction, and a horizontal extension. And a hook portion 10 bent downward in a bowl shape from the tip of the portion 9. A bolt insertion hole 11 for passing a locking bolt is formed at a position in contact with the upper edge surface 21 u of the side plate 21 in the middle of the horizontal extension portion 9 in the length direction.

The operation of attaching the handrail / hook metal fitting 1 to the side plate 21 of the ladder 20 is performed as follows.
A bolt 26 is inserted into the bolt head embedding hole 24 and the bolt hole 25 formed on the rear edge surface 21 b side of the side plate 21 with respect to the lower connecting portion 3, and the tip is screwed with the nut 6 to lower The connecting part 3 is fixed to the side plate 21.
In this way, when the bolt 26 is inserted from the rear edge surface 21b side of the side plate 21 and the tip of the bolt 26 is screwed with the nut 6 fixed to the mounting surface 5, the handrail forming portion 2 is handrailed and hooked. Even if a strong external force is applied in the direction in which the metal fitting 1 is to be pulled off from the side plate 21 (the direction of the arrow F1), the lower connecting portion 3 is firmly attached to the side plate 21 and there is no fear of detachment.

A locking nut is embedded in the vicinity of the upper end of the side plate 21 in advance. Then, a locking bolt is fitted from above the bolt insertion hole 11 and the locking nut is turned 90 °, whereby the upper connecting portion 7 is fixed to the upper end of the side plate 21.
The connection between the upper connecting portion 7 and the side plate 21 is also connected in a state where a locking bolt is passed in the vertical direction. Therefore, this connecting portion also has a strong connecting force against the external force in the F1 direction.

FIG. 5 is a left side view of the metal frame 1 ′ that forms the core of the handrail / hook metal fitting 1, FIG. 6 is a front view thereof, and FIG. 7 is a bottom view thereof.
5 to 7, the shape of the metal frame 1 'that forms the core of the handrail / hook metal fitting 1 can be understood in detail. The metal frame 1 ′ may be formed with ribs 1 a extending in the longitudinal direction for reinforcement.

8, 9 and 10 are configuration diagrams of the handrail / hook metal fitting 1 in a state where the surface of the metal frame 1 'shown in FIGS. 5, 6 and 7 is covered with a resin (for example, polyurethane foam). The handrail and hook metal fitting 1 is preferably configured such that the surface of the metal core 1 ′ shown in FIGS. 5 to 7 is resin-molded by, for example, injection molding.
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

For example, the handrail forming portion 2 of the handrail / hook metal fitting 1 may be configured to be longer than that of this embodiment.
Moreover, the handrail and hook metal fitting 1 of the present invention is not limited to a ladder for a bunk bed, but can be applied to a simple type ladder staircase that is used by being moved to a place where there is a difference in height indoors.

DESCRIPTION OF SYMBOLS 1 Handrail and hook metal fitting 2 Handrail formation part 3 Lower connection part 4 Curved part 5 Mounting surface 6 Nut 7 Upper connection part 8 Curved part 9 Horizontal extension part 10 Hook part 11 Bolt insertion hole 20 Ladder 21 Side board 21f Front edge face 22 Footboard

Claims (2)

A handrail and hook metal fitting to be mounted on a lifting ladder such as a bunk bed,
The lifting ladder includes a pair of wooden side plates,
The handrail and hook metal fitting is attached to each one end side of the pair of wooden side plates,
A handrail forming portion formed of a metal plate having a predetermined width and extending linearly;
A lower connection which is provided integrally with the handrail forming portion via a curved portion on the lower side of the handrail forming portion, and is formed by bending the lower end of the handrail forming portion so as to be parallel to the handrail forming portion. And
A mounting surface provided on a surface opposite to the surface facing the handrail forming portion of the lower connecting portion;
A nut that is welded to the mounting surface and projects from the mounting surface to function as a positioning projection;
An upper connecting portion provided integrally with the handrail forming portion via a curved portion on the upper side of the handrail forming portion, the upper connecting portion extending in the horizontal direction to the rear side of the handrail forming portion. An upper connecting part including a horizontal extension part and a hook part in which a tip of the horizontal extension part is bent downward in a bowl shape, and a bolt insertion hole is formed in the middle part of the horizontal extension part;
Handrail and hook metal fitting characterized by including. Elevating ladder unit such as a two-stage bed according to claim 1 Symbol mounting handrails and hook bracket is mounted.

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