JP5482638B2 - Stepladder that also serves as a ladder - Google Patents

Description

  The present invention relates to a stepladder that also serves as a ladder (hereinafter, simply referred to as a stepladder), and more particularly to a stepladder that has great stability when used as a ladder and that is compact when folded.

  Since the structure and intended use of the ladder and stepladder have been well known for a long time, further detailed explanation is omitted here.

JP2002-194981 JP 10-025982 A

  As a common sense, ladders are long and stepladders are low, so a ladder that also serves as a ladder is not common.

  On the other hand, Patent Documents 1 and 2 below propose a stepladder that also serves as a ladder, but both have a complicated structure and a large size, and are therefore inconvenient to carry.

  On the other hand, it is often convenient to have a stepladder that serves as a ladder for certain occupations and tasks.

  Accordingly, an object of the present invention is to provide a stepladder that is highly stable when used as a ladder and that becomes compact when folded.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a pair of vertical rods arranged in a divergent form like the eight characters of a Chinese character are connected by a plurality of horizontal step bars to form an overall shape. Constitutes an elongated trapezoidal support leg, and of the three support legs of the first, second and third support legs thus configured, the upper end of the narrower first and second support legs is connected to the first hinge. When the first and third support legs are deployed in a straight line, the base ends of the second support legs and the third support legs that are wider are connected by the second hinge means so as to be rotatable. On the other hand, when the base end of the first support leg is placed on the ground or floor surface and the upper end of the third support leg is used as a ladder by leaning against a standing tree, a power pole, or a wall surface, the ladder is connected by a hinge means. A stopper is provided so that valley breakage does not occur on the outside of the part, 3 An engagement rod parallel to the step bar is provided at the upper end of the support leg, and a shallow V-shaped notch that opens inward is formed in this engagement rod, and the movement in the width direction of the upper end of the ladder when this notch is leaned against a utility pole etc. In the case of using as a stepladder by expanding the first and second support legs with the second and third support legs overlapped, the engagement rod can be stored in the gap of the connecting portion by the first hinge means. The width is set.

  Since the latch device according to the present invention configured as described above has three support legs connected in a straight line by two hinge means and functions as a ladder when extended and as a stepladder when folded. It was possible to construct a stepladder that also serves as a simple ladder.

  Further, since the engagement rod at the upper end of the third support leg can be accommodated in the gap of the connecting portion by the first hinge means, there are various effects such as compactness and easy carrying when folded.

The front view as a ladder of the stepladder by this invention. The side view. The enlarged plan view which shows the coupling | bond part of a step bar and a vertical fence. Sectional drawing by the IV-IV line of FIG. The external appearance perspective view of an engagement rod. The side view explaining the process in which a ladder is folded and made into a stepladder. Side view of a stepladder. The side view similar to FIG. 7 which shows the state which flattened the stepladder further.

  Since the three support legs were connected in a straight line by two hinge means and functioned as a ladder when extended and as a stepladder when folded, a stepladder having a simple structure could be constructed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a first support leg, reference numeral 2 denotes a second support leg, and reference numeral 3 denotes a third support leg.

  As shown in FIG. 1, each support leg has a plurality of pairs of vertical rods 4, 4 arranged in a divergent manner like a Chinese character eight-character (the second support leg is an inverted eight-character) (the illustrated embodiment). Are connected by 3) horizontal step bars 5, 5 so that the entire shape is formed into an elongated trapezoid.

  In order to connect the vertical rods 4 and 4 with the step bars 5 and 5, for example, as shown in FIGS. 3 and 4, the cross section is trapezoidal between the U-shaped vertical rods 4 whose cross section is opened inward. Step bar 5 is sandwiched and riveted.

  1 and 2, reference numeral 13 denotes a rubber or plastic cap fitted to the end of the vertical gutter 4.

  Of the three support legs of the first to third support legs 1 to 3, the lower end of the first and second support legs is narrowed by the first hinge means 6 (see FIG. 1) and the second support legs. The base ends of the second and third support legs 3 which are wider are connected by the second hinge means 7 so as to be rotatable.

  It should be noted at this time that, as is apparent from FIG. 1, if the mounting portion 8 and the connecting portion 9 of the pair of hinge plates constituting the first hinge means 6 are coplanar, the first and second That is, the connecting portions 9 and 9 are bent when the support legs 1 and 2 are rotated.

Therefore, the attachment part 8 and the connection part 9 of each hinge plate are slightly twisted, and the connection parts 9 and 9 that are joined to each other are formed so as to be perpendicular to a horizontal rotation shaft that is not numbered.
The same applies to the second hinge means 7.

  Since this situation is the same as that of the conventional stepladder, further detailed description is omitted.

  In addition, the lower end of the vertical shaft of the third support leg 3 in the second hinge means is formed in a semicircular shape and is rotatably supported on the support shaft 10.

  As shown in FIGS. 1 and 2, since the first to third support legs 1 to 3 are connected in series, the base end of the first support leg 1 is placed on the ground surface or the floor, and the upper end of the third support leg 3 is It can be used as a ladder by leaning on a standing tree or a telephone pole 11.

  At this time, the stopper is provided so that the support leg does not open at the hinge portion, that is, the valley break does not occur outside the connecting portion of the ladder by the hinge means.

  In the first hinge means, the stopper is constituted by engaging end edges 12 formed on the hinge plate.

  Further, the second hinge means 7 is configured by pressing the vertical rod 4 of the third support shaft 3 against the cap 13.

  On the other hand, as shown in FIGS. 1 and 2, an engagement rod 14 parallel to the step bar 5 is attached to the upper end of the third support shaft 3.

  The engagement rod 14 in the illustrated embodiment is formed, for example, by forming a shallow V-shaped notch 15 opened inward in a horizontal portion of an aluminum plate having an L-shaped cross section, and a rivet at the upper end of the vertical rod 4 of the third support leg. It has been stopped.

As shown in FIG. 8 , the width of the engagement rod 4 is set so that it can be stored in the gap of the connecting portion by the first hinge means 6 when the stepladder is folded.

  When the stepladder configured as described above is converted from a ladder to a stepladder, as shown in FIG. 6, first, the third support leg 3 is tilted to the second support leg side, and then the first support leg 1 is tilted to the second support leg side. 7 is converted into a stepladder as shown in FIG.

  In FIG. 7, in order to prevent the third support leg 3 from being separated from the second support leg 2, the rotation of the second hinge means is reduced, or the portion where the second and third support legs are joined to each other has a different magnetic pole. It is desirable to embed permanent magnets facing each other.

  In FIG. 7, reference numeral 16 denotes a two-fold stop bar, and the free end of the leg is hung on a stop pin 17 provided on the first support leg to regulate the degree of opening of the stepladder.

  When the first and second support legs 1 and 2 are further closed from the state shown in FIG. 7, the stepladder becomes flatter as shown in FIG.

  At this time, as shown in FIG. 8, as described above, the engagement rod 14 is completely accommodated in the gap of the connecting portion by the first hinge means.

DESCRIPTION OF SYMBOLS 1 1st support leg 2 2nd support leg 3 3rd support leg 4 Vertical shaft 5 Step bar 6 1st hinge means 7 2nd hinge means 8 Mounting part 9 Connection part 10 Support shaft 11 Electric pole 12 Locking edge 13 Cap 14 Engagement rod 15 Notch 16 Stopper bar 17 Stop pin

Claims (1)

A pair of vertical gutters arranged like a Chinese character in the shape of a wide end are connected by a plurality of horizontal step bars to form a trapezoidal support leg having an elongated overall shape. Of the three support legs of the second and third support legs, the upper end of the narrower one of the first and second support legs is attached to the base of the wider one of the second and third support legs by the first hinge means. The ends are connected to each other by the second hinge means so as to be rotatable and foldable, so that the first to third support legs can be used as a ladder when deployed in a straight line, while the base of the first support leg is provided. When placing the end on the ground or floor and using the upper end of the third support stand as a ladder by leaning against a standing tree, utility pole, or wall surface, a stopper is provided so that valley breakage does not occur on the outside of the connecting part of the ladder by the hinge means, On the other hand, the upper end of the third support leg is connected in parallel with the step bar. A hook is provided, and a shallow V-shaped notch that opens inward is formed in the engaging rod. When the notch is leaned against a utility pole, the movement in the width direction of the upper end of the ladder is restrained. when used as a stepladder by 3 that superimposed support leg and to extend the first support leg, a ladder, characterized in that setting the width to allow housing the engagement Go杆in the gap of the connecting portion by the first hinge means A stepladder.

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