JPH0512480Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to a foldable ladder.

[Conventional technology]

Conventionally, this type of folding ladder has been known as described in the previously disclosed Japanese Utility Model Application Publication No. 58-143996, which will be explained based on FIGS. 5 to 9.

That is, in the figure, 1 is a pair of metal main pillars arranged oppositely, 2 is a storage groove formed along the opposing surface of each main pillar 1, and 3 is a storage groove in one of the main pillars 1. 2 is a metal treadle having a downward U-shaped cross section, the base of which is pivoted at a predetermined distance within the treadle 3;
5 is an engagement notch formed downward in the free end of each step 3, and 6 is a shaft with one end located in the storage groove 2 of the other main pillar 1 corresponding to each step 3. These are pivoted metal auxiliary bars with a U-shaped cross section, and each auxiliary bar 6 has half the length of the treadle 3, and the length of the treadle 3.
The other end of the auxiliary bar 6 is rotatably attached to the center of the lower surface of the step bar 3 via a hinge 7. Reference numeral 8 denotes an engagement shaft to which each auxiliary bar 6 is pivotally connected, and the engagement notch 5 of the step bar 3 can be freely engaged with the engagement shaft 8. Reference numeral 9 denotes an auxiliary beam provided on the upper end of the main pillar 1 with a hinge or the like so that it can be fitted freely, and 10 denotes a pair of braces pivotally attached to the lowermost step beam 3 so as to be freely retractable. is constantly urged outward by a spring member 11.

In the conventional ladder constructed as described above, when folding the assembled ladder (see Fig. 5), the reinforcing bar 9 is removed from the upper end of the main pillar 1, and then the main pillar 1 is pushed inwards from both sides. Press in one direction. Then,
The engagement between the engagement notch 5 of the treadle 3 and the engagement shaft 8 is released, and as shown in FIG. and rotate upward in conjunction with each other. When the main post 1 is further pressed, the treadle 3 rotates further and is completely fitted into the storage groove 2 of the pivoted main post 1 and is stored.
The auxiliary crosspiece 6 is also fitted into and stored in the storage groove 2 of the pivoted main pillar 1, and similarly, the brace 10 pivotally connected to the lowest step 3 is also pushed inward against the spring material 11. It is folded up and completely stored in the storage groove 2 of the main pillar 1 together with the step 3 (see FIGS. 8 and 9).

On the other hand, when assembling, contrary to the above, main pillar 1
It is best to pull it outward. Then, the treadle 3 and the auxiliary tread 6 rotate downward about the pivot shafts 4 and 8, respectively, and the engagement notch 5 of the treadle 3 engages with the engagement shaft 8. At this time, the brace 10 attached to the lowest step 3 is urged outward by the spring material 11, and its lower end abuts the inner surface of the storage groove 2 of the main post 1, and
Its lower surface is flush with the lower surface of the main pillar 1. Finally, the reinforcing bar 9 is fitted onto the upper end of the main pillar 1 to complete the assembly (see FIGS. 5 and 6).

[Problem that the invention attempts to solve]

However, the conventional ladder configured as described above can be folded extremely compactly.
Although it is very convenient to carry and store, since one end of each step 3 is a free end, it is easy to deviate from the storage groove 2 during assembly or folding, making assembly and folding work very troublesome. It was becoming.

This invention solves the conventional problems at once, and allows the free end of each tread 3 to move along the storage groove 2 of the main post 1, making it convenient to assemble and fold the ladder. It attempts to provide a ladder.

[Means for solving problems]

That is, in this invention, a guide piece 14 is provided at the free end of each step 3 via connecting members 12, 22, and one main post 1 is provided in correspondence with the guide piece 14.
A guide rail 15 is provided in the storage groove 2.

[Effect]

When assembling or folding the ladder, the guide piece 14 is operated along the guide rail 15, and each tread 3
The free end of the main pillar 1 can be reliably moved along the storage groove 2 of the main pillar 1.

〔Example〕

Below, one embodiment of this invention shown in FIGS. 1 to 3 will be explained.

Reference numeral 12 denotes a connecting member of a required length pivotally attached to the free end of each step 3, and the connecting member 12 is always biased upward via a spring member 13. Reference numeral 14 indicates a pair of rollers on both sides that are pivotally attached to the tip of the connecting member 12, and reference numeral 15 indicates a guide rail provided in the storage groove 2 of the main pillar 1 to sandwich and guide the rollers 14. Note that other parts are the same as those of the conventional example, and the same reference numerals indicate the same parts.

The ladder according to this invention configured as described above is
During assembly and folding, the rollers 14 roll along the guide rails 15, so that the free end of each step 3 can be reliably moved along the storage groove 2 of the main post 1.

FIG. 4 shows another embodiment, in which the connecting member 2
This embodiment differs from the first embodiment in that 2 is configured to be flexible via a link piece 23, etc., and other parts are the same, and the same reference numerals indicate the same parts.

Although the roller 14 is shown as the guide piece in the first and second embodiments, the guide piece is not limited to this, and any known rolling element or sliding element may be used. Of course.

[Effect of idea]

According to this invention, as described above, the guide piece 14 is connected to the free end of each step 3 via the connecting members 12, 22.
A guide rail 15 is provided in the storage groove 2 of one main pillar 1 corresponding to the guide piece 14.
, the guide piece 14 can be operated along the guide rail 15, and the free end of each tread 3 can be reliably operated along the storage groove 2 of the main post 1, making it possible to assemble the ladder.・It allows folding work to be performed extremely smoothly and reliably.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment of this invention, with Figure 1 being an enlarged sectional view showing the operating state of the treadle 3, and Figure 2 being a partially enlarged sectional view showing the assembled state. , FIG. 3 is a sectional view taken along the - line in FIG. 2, FIG. 4 is a partially enlarged sectional view showing the second embodiment in an assembled state, and FIGS. 5 to 9 are conventional examples. 5 is a perspective view showing the assembled state, FIG. 6 is an enlarged sectional view of section A in FIG.
The figure is a perspective view showing the folded state.
It is an enlarged sectional view of part B in the figure. 1...Main pillar, 2...Storage groove, 3...Treadle, 5...
...Engagement notch, 6...Auxiliary crosspiece, 8...Engagement shaft, 1
2, 22...Connecting member, 14...Roller, 15...
...Guide rail.

Claims (1)

[Scope of utility model registration request] A pair of main pillars 1 provided with storage grooves 2 along the longitudinal direction, a step 3 with a U-shaped cross section that can be stored in the main pillar 1, and a half tread that can be stored in the tread 3. It consists of an auxiliary crosspiece 6 having a long length, one end of the treadle 3 is pivoted into the storage groove 2 of one main pillar 1, and one end of the auxiliary crosspiece 6 is attached to the storage groove 2 of the other main pillar 1.
The other end is pivotally attached to the center of the lower surface of the corresponding step 3, and the free end of the tread 3 is engaged with the engagement shaft 8. In a folding ladder formed with a notch 5 that can be freely combined, a connecting member 1 is provided at the free end of each rung 3.
2, 22, and a guide rail 15 is provided in the storage groove 2 of one main pillar 1 corresponding to the guide piece 14. .